Ezrin was always supposed to be a ninja
Ezrin had a father who always got what he wanted due to his ability to complete favors flawlessly, whether it be tracking quests, or assassination attempts.How do you do something flawlessly and only get an assassination 'attempt'? Semantics, i know but i'd prefer you not go for the 'flawless parent figure' only for him to be offed by a mysterious attacker who we never hear from again.
In combat he is rather weak, as he would rather make peace with others. but when the ability to fight is all he has, then he can be pretty ruthless, as he can chain combos successively.Neither of those really justify what happened because all you said he did was pin down the enemey. Also, it's contradicting. Either he's weak in combat or he's not. Pick one. Or give a proper situational approach rather than he's bad but then he's good, it doesn't make sense.
When it comes to the "true" battle, the ones he can't escape, he fights with his stronger attacks first, to try and get rid of the problem first. He has some hand to hand training, but isn't very well at using it. He stumbles a lot, and tries too hard to predict movement, especially since he isn't really strong physically.