If a monster is stunned, it cannot be moved and it cannot attack investigators. But investigators still have to evade when moving out of the space? We had a hell of a time last night where we had stunned two monsters that were sharing spaces with everyone, but everyone got hit by both of them on the way out, which was devastating.

And evasion damage is different than combat defense damage in regards to the warding statue, which limits max damage to 1 while defending?

And if an investigator is stunned, they still get an action? I thought the wording was pretty unambiguous, but someone else asked that on here and got the response that stunned only reduces the number of movement actions you get from 2 to 1 rather than having a single movement be the only thing an investigator can do.

There is an FAQ coming apparently, in meantime this is the answer designer gave someone with same question about interacting with stunned monsters:

1) Stunned monsters do NOT cause evade checks (ie: investigators can freely move through them).
2) Stunned monsters DO cause horror checks.
3) Stunned monsters MAY take samples (although they can't move).

From:

http://boardgamegeek.com/thread/623428/rules-questions-and-answers