UPDATE
Evacuation zone
Evacuation zone mechanic is implemented, during each building exploration map there will be exit points, to evacuate simply move character on top of it, will take a few seconds for character to evacuate during which other characters can cover him, if he got reflex skill the evacuation timmer will be lowered, in some situation is best not to be greedy with looting while monsters come closer last characters evacuation will be a problem, or you can set automated defenses with engineer to cover evacuation if you have engineer in squad, many MANY possibilities, and gameplay approaches tactics.
The character may evac map at any time he desires but he must take in consideration that each evac will increase aggro(overall difficulty, awareness of monsters) every action got a consequence.
I also added some testing resources in the gif for fun.
