Some people walk through multiple gunshot wounds without flinching, some collapse after one. Just because you were stabbed through the hand and it was rendered useless, doesn't mean that the same will happen to someone else.
I think Cro Cop is a pretty cool guy, eh sends head into orbit and doesn't afraid of anything
I did wonder how he was able to punch people and grip things and just, in general, act as if his hand wasn't in severe pain. Finally I chalked it up to extreme amounts of adrenaline surging through his body.