About 12 to go in the 4th. Texas goes for it on 4th and goal. Throw is just short of the end zone. Reciever puts his hands on the ball, firmly controls it, starts going to ground, catch clearly not completed yet, his knee hits while the ball is firmly controlled in the field, but the process of catching the ball isn't complete until he's in the end zone. Ruling is down on the 1, over on downs, replay doesn't intervene.
Anyone got a rule reference to tell me why this shouldn't be a touchdown? Does it change if he never firmly controls it until he's lying in the end zone? The mental block I'm having trouble getting past goes like this; if he'd dropped it while his knee was down and the ball was outside the end zone, you'd have called it an incomplete pass for not establishing possession, so how can he be considered down when he hadn't actually caught the ball yet?
(Couple of plays later, the OSU QB walks out the back of the end zone before throwing an interception.)