It was. I called it on the first replay and was telling everyone here 'that is not a catch (assuming his hand wasn't under the ball)'. I understand the rule may not be liked, however, the rule is clear: when you catch the ball falling you must maintain control through the process for it to be a catch and possession. That wasn't even close, the knucklehead receiver stretched out before it was a possession and when the ball hit the ground it clearly, 100% moved. Case closed, 100% correct call, receiver was falling as he caught it and it must be maintained through the process.Bad rule? Maybe, probably, but that is irrelevant to this play now. That play is entirely on the receiver for not making sure the catch is made and/or making sure when he reached out to cross the plane it is fully maintained/doesn't move. His dramatic stretch was unneeded and was one of two inexplicable plays that cost the Steelers the game (the other being Ben throwing into such heavy traffic).