Talk:Known Bugs And Glitches/@comment-3529826-20120116223830

"If you have autopause on and are close to an NPC, you will be able to talk to them as if the game was still playing while everything around you will remain still. This can be useful if you are fighting a boss and have low health and the Nurse is near. This is only confirmed on single player."

I don't think this is a bug. More like a feature. By the way if you need this trick to stay alive during a bossfight, it is very likely that the boss will kill the nurse before you are able to win the fight.