And looking back at that, it confirmed for me that Grace is the killer. She didn't have the balls to kill back then, so she only assaulted him. She was the only person to know he was going there that night.
Also, Ryan said the hint was in the pilot, not in Hell Week. All the hints that make it "obvious" that it's Pete (the costume, his weird stares, and so on) all occur in Hell Week, not in the Pilot.
That haircut doesn't match Chad, Pete OR Boone. Boone (Nick) has a complete buzz cut, and so does Chad. Pete's is too long. Look at the way the hair is pushed up towards the front of the head. None of our males have a hairstyle like that.
