Man I hate those invaders that run through the whole level, you get curious and go find them, then they stand at the bottom of the elevator before the chasm, wait for you for 20 mins to come down, and WoG you off the edge from behind the wall. Forcing you to play through all that again just to retrieve your humanity and souls.
This is the part of DaS that I hate, people that just want you to rage quit.