I'd be surprised if the NBA did not rescind the technical foul. To me, it appeared as if it was a heat of the moment reaction that resolved itself. Usually a heat of the moment reaction is allowed (within reason) if the player does not direct it toward the official and the situation resolves itself quickly (which I think he did a good job of walking away).
As to the call, Ed Rush called a hit which surprised me as I also thought he was calling a foul on the displacement. It's possible he saw something from his angle which they never showed.
On a side note, Perkins can mean mug with the best of them!
