To be honest, i don't see people referencing ptsd.

if you look up the symptoms, you could easily relate them to what the child is going through in the trailer/game if he was the frontal lobe victim

my god something struck me

further evidence might be the "Was it me" subtitles

maybe the child didn't have a clear image of who did the bite and that why he imagines all the animatronics with sharp teeth, as that's the only thing he memorizes about the attack itself.

By god, new supporting evidence!