Iz Stated that Tony doesn't kill you in a previous post

Despite this, Tony gives you the same type of Game Over screen as everyone else, I think that none of the characters (bar the Night 6 characters) actually kill you, I think if you get caught by any animatronic, Mark meets the same fate as he does on Night 5. (Mark technically isn't dead at the end of Night 5, he still walks and attempts to speak, as seen in his game over screen)

If you wear the Mask for too long you black out and get the text "Welcome Home" which is what is also said on Night 5's 6am screen, even calling the police won't help as "You were still found"

I think that regardless of what happens, Mark will meet his fate of having the mask forced onto him and becoming insane (as you can see by his crazed smile behind the mask)

This Mask (or maybe Mark himself) has some significant connection to The Figure, The mask is basically identical to the one The Figure wears, and on their game over screens they both say "I Found You"

We know that the animatronics are acting the way they are because of their AFRS (Advanced Facial Recognition System) malfunctioning and making them act hostile and violent towards people, I believe that this was The Figure's doing and that the true reason The Mask fools Johnny and Harry is because maybe they think another animatronic already forced the mask onto Mark,so they have no reason to attack him(If this is the case i'd just assume the other animatronics see through it and are aware it's a disguise)

I don't know who could've possibly made The Figure, I'm hoping we get more on that another time, but here's my current theory; we know the animatronics require a "Personality Chip" to act like their respective character (No Personality chip means they'll be less expressive and more silent) Maybe a rogue employee made a personality chip to make The Figure act how it does, making it Murderous (It could also be a random Endo malfunctioning due to the lack of a personality chip, as The Figure speaks way less than the other animatronics and sounds extremely robotic which lines up with how the characters act without a personality chip, Maybe The Figure was the first animatronic to have their AFRS malfunction, and it done something to the other animatronics making theirs malfunction too

We know that Mark has some type of connection to the Johnny Doll found in the Warehouse, as he faints upon finding it on Night 3 and in seen with it in the Night 6 cutscene, I honestly don't know why he has such a connection to this doll, but I'm hoping we'll find out more in potential future instalments