when the lights are on, the lights will flicker, but it won't spawn until 4 - 7 rooms in advance, it can prepare to spawn at any time, but won't spawn until at said amount of rooms are opened, it starts off at a somewhat normal pace, so that you get to hear it's audio, but once it's a certain distance from the room that spawned it, it becomes extremely fast. Later on, there is a chance it will attack twice, on the second attack it will still be extremely fast, but will still be audible
Yes I removed all the funny faces >:)