ToME: the Tales of Maj'Eyal

I've noticed in a number of cases that mobs that are hit with Corrosive Vapors (while out of line of sight from my character) cannot seem to find me. This often happens in vaults, where sometimes the mobs actually run away from me. The 3 mobs in the attached picture have been hit with Corrosive Vapors more than once, and have my character targeted, but will not leave the pit even after the spell has expired.

I don't think they should be able to "find you" in that situation. However, they should attempt to move out of the cloud of acid. If that means moving away from you, because that's the nearest exit, then I think that's the correct behavior.