I don't want to get pulled into an argument about weapons, but......
Wow, the guy with the gun is totally insane. If he had shot the guy, the bomb could so easily have been triggered, either by a dead man's switch, the twitch of a hand, a badly aimed shot, impact with the ground, a bullet hitting the bomb itself, etc. That would have killed all kinds of innocent people.
He got lucky that the guy cooperated, but what he did was incredibly irresponsible. I mean, what's more important, the innocent lives of the people in the bank, or the bank's money?