As you can see, there is red hand prints on Freddy. Is it pizza stains? Is it blood? Did he cause the bite of 87?

If he DID commit the bite of 87, here is some reasons why the handprints are involved:

1: The child was trying to push him off/ his jaw to pry himself free

2: After the child died, the brother opened the jaw

If it was pizza stains, we all know why. Its a pizzeria for gosh darn sake.