I forgot that in J3 2Ch (Jolly 4 Anncoument trailer) the end of the anncoument trailer it shows us theo is calling is us (About that is facility collapsing) and the night guard, also shows us the collapse in evelator and in undergound.

And the next teaser trailer on tik tok IvanG (Teaser video in IvanG Tik tok got deleted)

It shows us mask of Jolly (That is too in J3 2Ch trailer) but more differnet than in trailer J3 2Ch and shows us the collapsing too of the 1 floor or 2 floor and the factory maybe get collapsed because of old building or the floor that we be in J4 and this is reaching us to the one. That the 1 floor or 2 floor got collapsed first and the undergound was collapsed as last. And is reaching us is First Ending-Collapse ending.

(This is a theorie so i don't know it will be in the game) (Sorry for my bad grammar my bad i'm learning english) (Sorry if is it so long)