"I disagree because you're aren't considering the damn consequences of these actions. What if you lost the game? What if you sustained a serious injury? What if the whole point of that game was to pre-emptively injure you so a resulting battle would be easier on his part? What if this envelope has nothing of value whatsoever in it?"
He takes a deep breath before calming down enough to continue in a far more neutral tone, "I suppose it's not important at the moment, since we (hopefully) have what we came for. Just take a moment to think next time before you agree to play a knife-game with a criminal. I don't even know why you are so opposed to the situation escalating to combat anyway. We could have not only retrieved the information, but cleaned up some of the filth infesting this city at the same time."