Do monsters despawn?

[TheLittleGarfield]

The way the following works is that there are areas wich enable a Brute connected to that area.
When an area is triggered it is disabled, and no more area can be triggered until brute is disabled.
Brute will be disabled if the player enters a torture room corrdidor (and each its end) or by normal
means (player cannot see brute and its path is over). After this new areas can be triggered.