A Release Mechanism is used by the Hunters.
When a hunter triggered a Release Mechanism, the light goes green and if it isn't triggered: the light goes red. A main character must kill one of the hunters, then carry and places him on a release mechanism to keep it opened.
In Manhunt, there is a Release Mechanism with a sign: Security Zone, that is used by the Smileys in the Scene 13: Kill the Rabbit, one of the Smileys in the Workshop; triggered a release mechanism to open a Metal Gate for The White Rabbit.
In Manhunt 2, there is also a Release Mechanism with a sign: Stage Door, that is used by The Pervs in the Episode 3: Sexual Deviants, one of the Pervs in the Strip Club; triggered a release mechanism to open a Stage Door for a Stripper.