Super Bowl penultimate question

[Moran]

So right before the worst call ever Butler and Kearse went up together for the ball, both came down and the ball was still free and Kearse makes the catch - however, while the ball was still alive, #30 for the Patriots - Harmon - goes over Kearse thinking the ball is dead - what if he had dropped down and hit Kearse hard at that point, preventing the catch - would that have drawn a penalty?