Ragdoll

Hey all,I started to make a killing bot and encountered a problem:When I turn on physics simulation then the bot crashes and becomes plushevii.But I need that he would have even reacted to the bullet,for example I shoot a bot in the head and you have to be that he was falling back.But if for example shoot from behind his head he fell forward and whatever bullet it was a little push in the right direction.Is there a solution?