Aiken had 3 guys on him with that catch, Joe simply should of thrown somewhere else but in situations like that he tends to already have his mind set on who he is throwing the ball too before the ball is even snapped.
I blame the NCAA for even allowing 1 foot down to be ruled a catch, thats when most guys are learning the most and gaining that muscle memory. If they changed it to 2 feet down like every other level then you would see a lot more younger WRs making those catches. Perriman is still very young and will make a lot of spectacular catches for us throughout his career.