When attacking people in a restaurant, some of them that are sitting will slump over and 'die' with their heads on the table. Yet they are still alive in the game. But you can't lock on to them. You can't kill or hurt them ether. Blood splats, but nothing else. Punching, using melee weapons, shooting, using the chain saw, and even throwing grenades of other uses of explosives doesn't do a thing to them but splatter a little blood. Yet this supposedly 'dead' person will still talk to you if you bump them. Sometimes they'll still do the random compliment or insult and you can still have CJ respond to them.