Mogan was about to reply to Suntalia's suggestion about forming a pranking alliance, but Jima, having clearly overheard possibly thanks to her detached supersenses, interjected first.
"Well Suntalia, it seems like our skills as pranksters have been challenged. I say this requires a decisive and swift response, or else our reputation will be tainted! That being said, why don't we make things a bit more interesting? Let's bet on who will be able to pull the best prank on Jima. Lilly will be our judge. The loser will have to clean and tidy up our room for a month. We will have one week to do the pranks, and of course, if Jima discovers the prank then the one that gets discovered is disqualified. If we both get discovered then we both lose and we will have to cover for Jima's turns of cleaning for a month each. How about it?"
Mogan was pretty confident he could pull a couple of interesting pranks on Jima. She had made a mistake by revealing so much about her semblance, thus giving him the opportunity to work around it in order to deliver his prank! That said he didn't have any ground for assuming his prank would be better than anything Suntalia could come up with. This would require some time and meditation...
Mogan was absently listening to Lilly revealing that she would attend a dance school in her free time, which could be fun. It would probably just mean that they would be part of the public for her performances, but they would probably hang out together after.
His thoughts were cut short when Lilly found a lone Ursa.
Mogan stepped forward, activating his semblance and inserting both his arms inside the holes on the sides of his suitcase. Said suitcase mecha-shifted in two different pieces of heavy armor that covered up to his shoulders and a belt with several pockets.
The whole process didn't take more than a couple seconds, plus one more to actually put the belt on.
"I did say that would demonstrate once we found a prey, so if you don't mind I'll take this one. I actually give my best when I face big targets, while on the other hand lots of small and fast enemies like a murder of little nevermores can be considered my worst matchup."
Mogan started to explain while casually walking towards the Grimm, which, having taken notice of the approaching hunters, got up on his hind legs and roared threateningly, revealing his pearly white fangs.
"First of all, I have a time limit on my semblance. I can activate it for five minutes tops, and after that, it can't be used again for at least twelve hours. I also have to wait ten seconds before it actually activates once I wish to use it."
Having said that Mogan easily slipped under the first paw swipe that the Ursa had aimed at his head, and moved around it, in order to force him to turn around to follow him. He was quick and light on his feet. His movements weren't elegant like Lilly's but hinted at a fighting style aimed at being practical. Since the grimm had used his left arm for attacking, he ended beside his left flank and he turned to deliver a powerful right-handed punch to the elbow of the beast.
"Once I activate it I can't deactivate it unless a set time has passed. But while it is active any non-prolonged impact I deliver or receive gets canceled."
True to his words, the punch didn't seem to have any effect whatsoever on the target.
"The more times it passes after the hit, the more the effect will be amplified, that is unless I hit the same target again or it hits me. The effect reaches its peak at ten seconds, tripling the consequences of the punch."
While he talked, Mogan kept dodging the swipes and bites of the ursa. He moved with ease, his footwork was practiced and he always seemed to start moving a moment before his enemy even started attacking.
"The downside of this semblance is that these rules apply to me too, so if I get hit I risk of having to suffer increased consequences too. That is the reason I can't function as a tank unless specific conditions are met. For instance..."
His exposition was interrupted when the elbow of the Grimm exploded with a sickening crunch, precisely ten seconds after he had hit it. The Ursa roared in pain and shook the offended limb, whose forearm was connected to the rest of the body only by some dark filaments that were rapidly snapping after the weight. Mogan took the window to collect a couple of small stones from the ground with one hand and then punched them with violence with the other. Once again nothing happened to the stones. The enraged Ursa, with a loud thud, got back on all four... three. And tried to grab his left arm with his powerful jaws. Mogan, of course, didn't let it happen by jumping back, then extended the same left arm in a stabbing motion. From his wrist came out a short blade that should have stabbed the Ursa's eye, but once again it did nothing. The confused grim seemed to brace for the impact, but instead of being blinded it seemed like the blade had just bounced on his glowing red eye.
"... As I was saying, I really can't afford to take hits while my semblance is active, unless someone or something kills or incapacitates my target before the ten seconds are up. In that specific case, the effect of the blow simply disappear, so I can virtually tank anything that hits me as long as my enemy dies within ten seconds and I don't get hit more than once."
Having said that he opened he passed the stones he had held in his left hand into his right hand, and in so doing he flipped them. Then, dodged laterally another bite and, instead of throwing the stones, he loaded his arm back and made a move as to violently push them horizontally towards the Grimm's head. There was certainly some force in this movement, but nothing that could justify the speed with which the two stones seemed to propel themselves forward. Considering the mass of the stones and their speed, they should have at least have seriously cracked the mask of the Ursa. But once they hit, what instead happened was that the eye Mogan had previously poked with his hidden blade collapsed inward with another loud and unpleasant sound, while the stones fell to the ground. While the poor beast roared and trashed around, now half blind, Mogan continued his exposition with a casual tone, like he was talking about the weather.
"What happened now is that I hit the same target again before the countdown was completed, so the previous effect activated early, albeit with less power. As you have perhaps noted, I let the stones charge for a bit before using them against the grimm, so if I did my math right, now what should hit the Ursa's head once ten seconds elapse, is the force of my punch multiplied approximately by three plus the force of the trow and again multiplied by three. So something like the consequences of being hit by a punch slightly more powerful than my original one multiplied by nine should manifest on our unfortunate experiment just... about... now."
BOOM!
The poor Ursa instantly collapsed on the ground and started to dissipate in black wisps of smoke. Mogan inspected the points of impact with a slight frown as if he was trying to understand something that didn't quite sit right with him.
"On second thought I did use two stones... so to be more precise I hit it with two distinct blows each with four point five more power than the original punch. So that's why it didn't quite blow his head off. Maybe I should have aimed for a leg, but then again it would have made me appear cruel. Usually, I try to dispatch of my enemies as quickly and efficiently as possible, and that is especially true if I'm using this damn semblance. As you can imagine I'll never use this semblance in a friendly spar against a student that doesn't already know at least it's basic rules because a slight mistake could cause serious damage to both. When fighting a human opponent the element of surprise is my biggest advantage, so I'd thank you if you could keep what you learned about my semblance a secret. There are more rules and exceptions, but this should give you an idea. Honestly speaking I hate it, and I prefer not to use it unless I'm forced to, but you still had to at least know about it."
He paused for a moment, apparently thinking about something.
"One last thing... If, during a fight, I have my semblance activated and you see me aiming at our target with my right arm, then stay away."
With several clicks, the armor that covered his right arm shifted to reveal an actual small cannon.
"You can imagine what would happen if you got hit by a charged cannon shot... And that concludes my presentation! Who wants to take on the next one we find?"
Mogan finally asked, changing his cannon back into its standard form.