That's a game mechanic. After power reaches 0% If you don't move your cursor and it's 5AM you have a chance to make it if Freddy doesn't jumpscare you after some time. Not moving the cursor just buys you more time to not get detected basically
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that is incorrect, the amount of time you can survive after the power goes out is entirely up to random chance - freddy showing up, everything going dark and then the final jumpscare each only happen once an rng roll succeeds (forgot the exact numbers), code bullet made a great video about fnaf ai a while ago and i'm assuming that this game's ai is made in the original's likeness
main difference i've noticed between ai's is that freddy can't be office stalled and foxy gets paused only if you look at cove instead of just flipping the cameras up so don't take that video as a tutorial on what to do in this game