Aargh. Just died from a ladder, wish I had knew this before. They're indeed more deadlier then infected. Learned my lesson, will never ever use a ladder again in game, no matter what the loot up there could be (I don't remember them being that problematic in A2 gameplay) That's really one of that very very bad things about the A2 engine (if that's the source of the problem as people here say), I hope they fix this in A3.