Team A has a 4th down coming with the ball at the B5 yard line. They come out of the huddle with 4 interior linemen (numbered 50-79) with the snapper wearing #9. They are in a "standard" field goal kick (scrimmage kick) formation with "holder" at about 7 yards back with a knee down and the "kicker" behind him. Before the snap, "holder" who is also the 2nd string QB, stands up, and the "kicker" moves further back so he's 10 or more yards behind the LOS. After all players are set for 1 second, the ball is snapped to the now "up-back" who proceeds to throw for a TD to the right split end. Team B coach complains that this is an illegal formation as no player, in position to receive the snap, has a knee down. What say you? Rules references please.