Well, tonight I was leveling RDM in the lower levels of the tomb. Sadly got agroed by a couple dire bats on the way and made my way out via the stairway warp. Now, normally, you'd think it'd be safe since it's a warp? However, tonight, the bats decided to follow into the outter (low-level area) where I quickly got smacked down.
Honestly, I don't remember when mobs from the lower-level were even allowed to come out, but apperently that's no longer the case. I'm seriously hoping this is a glitch, cause I imagine something far worse being pulled out of there (outdoor Vrtra anyone?)