Let's talk about Harris's catch.

[O.city]

Originally Posted by Amnorix

Yes, but not relevant if a half-second later the ball is ripped out. See my prior question about whether you'd be ok if it was ruled a catch/fumble if that exact sequence happens at, say, the 5 yard line and the ball is pulled out and "recovered" by the Steelers.

If he has 2 feet down and controlled the ball in the endzone the play is dead. You said so yourself

So yeah, had this happened in the field of play by that, it would be a fumble

But today's catch no catch rule is about as clear as mud