They could trigger a crushing ceiling when a monsters out-state is consumed, destroying the monster. In nightmare mode, the monster would shortly thereafter be respawned to its original location, ready to take on another value from its inputs.

edit:

>The respawning happens after a randomized time delay (roughly 8 seconds to 5 minutes) - https://doom.fandom.com/wiki/Spawning#Monster_respawning

for particularly subjective definitions of 'shortly'