He turned his back to the LoS consistently and tried to run backwards at the first sign of any pressure. He had pockets to step into plenty of times and failed to do so. That is the definition of rattled.
People don't want to admit what their eyes are seeing because they cross their fingers (and close their eyes) and hope he ends up being good. I hope he ends up being a fantastic QB too but it doesn't prevent me from seeing the obvious - the kid looked in way over his head yesterday and was rattled from the 2nd quarter on.
This team is going to ruin Allen (cue all the fans who claim you can't ruin a QB) by instilling in him the idea he can't stay in the pocket and has to continually break out to make plays. He did this at Wyoming and he's doing it here. His footwork (which is the cause of his inaccuracy) is never going to improve under these conditions.
I'd rather suffer an entire season with Peterman than throw Allen in there and destroy his confidence and hinder his ability to improve his footwork.
And if the Bills insist on sticking with him, for the love of God establish a running game and set up a screen game that can build his confidence little by little.