Trick Play from Memphis-Louisville Game

[OverAndBack]

Does it depend on whether or not he's gone under center and whether or not the act of removing himself from under center prior to going in motion simulates a snap?

If the quarterback yells something like "I forgot the play" or "Give me that again," a non-cynical person might conclude that he really forgot the play or wasn't clear on it - unless they then snap it to one of the up backs and he tries to score, then it becomes pretty obvious that it was a deceptive play that goes outside the realm of normal football deceptions. Then I'm flagging it - and letting the play run (I guess) and sorting it out afterwards. Supposin' the upback fumbles and B recovers?