This is talking about the behavior and some theorys about Foxy the Pirate.

The image provided shows his Jumpscare, which, unlike the others isn't an
 up-in-your-face-attack. In fact, he doesn't appear to be attacking at all but
perhaps checking in on the player, which launches us into this theory.
this theory is... get ready..... Foxy is trying to help the player survive
all 5 nights. Thats right folks. Automatically you object.
"He is an animatronic! He kills you for pete's sake! And he's
Creepy anyway!" hold your horses! when you Don't check your
cameras he comes. "Yeah, so that seems odd, but the whole
place is odd!" he only partially enters your room, and upon
seeing you he activates his voice box. Nothing more.
Let me paint a picture. You are the night guard
at a freaky place with loads of freaky things trying to
slowly and painfully kill you. and one of them comes
up to you unexpectedly.In support of the theory, I think
Mike  may just have had a heart attack. simple as that. It makes sense.
Then again, this doesn't carry over to FNaF 2 where he full-on tackles you,
mouth wide-open.

Foxy's behavior is slightly different from the average killer animatronic.
He is only seen 2 places on camera, but slowly comes out of his
curtain back in Pirate Cove before sprinting down your hall
to peek into your office.

Happy Crafting,
Freddy Fazbear Inc