The first assassin.
It's not made clear whether he was lying in wait for a while, or made up his rather aggressive strategy on the spot. The implication is that he has been waiting, because Bourne starts looking around his flat for someone. Either way, I'd like to sit him down afterwards and ask him if the strategy of swinging in through the window, randomly firing automatic weapons has been successful for him in the past...
Doesn't seem very "assassin" to me, more like the plan of an incredibly angry moron.
He doesn't have much of a back up plan either, he pulls out a tiny knife, then gets absolutely ruined by Bourne with a pen.
Basically he was terrible and I'm glad he died.