"Eh?" she stops her rambling for a moment as she processes what Akel said. Only fire and lightning? "Only those? I suppose they're the easiest to use, but that seems so limiting," she says honestly. "It's your decision in the end, though."
She takes a moment to ponder Akel's question on gravity dust. In short, yes, its possible. Clara's mind immediately drifts to the pack of cards in her pocket. There was definitely one person who used dust like that. That being said...
"There is a way, but if you want a continuous effect, you have to have a way to apply the dust over the entire duration," she begins, the cadence of her voice slowing down as she works through technical details, "The easiest way to do that would be with an appropriate semblance, but I'm going to go out on a limb and guess you don't have that kind of luck. In that case, you'd need a device to meter out the dust to make sure it doesn't all activate in one go, and then you'd need to get it to your target. A bullet's probably too small, you'd at least need something like a taser. A mine could work, but that would imply you had time to set it up before hand, which isn't necessarily something you could rely on in the field. Maybe something like a grenade could work? If you give it a bit of adhesive so it sticks, you wouldn't have to worry about it kicking it away."
"As far as delays, the most obvious solutions would be mines and grenades, which should be pretty easy to implement in theory," she pauses here, hand on her chin as she goes deep into thought, muttering to herself in technical jargon.