to whoever said it was staged and thats why they didn't notice...i understand, but this was so well thought out you'd figure they would have reasoning for that
slenderman does have paranormal powers but my take on it was that J did something to TTA that caused him to convulse, maybe he even stabbed him without remembering...it doesn't show
slenderman could've erased J's memory but i dont think he took the knife and killed TTA, i think J may have stabbed TTA when he attacked him and left the knife in TTA's stomach or wherever because we heard coughing and sounds of someone being pretty badly hurt, which was clearly not J
i think slenderman was present in every single part of that movie, in fact he's in the background of most of the clips, so it's safe to assume he was there in #18
idk why we're even speculating about this, it's blatantly fake