Ah you see, now you are asking the magician to reveal his tricks (triggers)
But yes, the generator room is a "safe zone" so that it does not corner the player (It will spawn again though), the spawning sound is just to add tension not to signify that the monster spawned, its a cheap trick only made for 1 time playtroughs, this jam I realized just how much the horror dev plays the magician with hidden tricks. A timer would kill the tension of the chase scene.
The biggiest problem with replaying the game is that everything was made to be only encountered once and thats it, the game is basically the opposite of replayable.
It despawns after 15 seconds but it stops chasing you after like 10 seconds I think, just so the player does not immidately see it despawn, this is ofcourse guessing that the player does not stare back and see the monster stop.
Anyways. Thank you for playing and I'll shoot you a quick messege once the game is more polished and playable. Thanks once again for trying so hard to decipher this puzzle hell game!