[just another ref]

I don't think I could overlook this one. The action itself is bad enough, but it this particular situation apparently the player was not already holding the ball.

Team B rebounds with 2 seconds left, calls timeout. Drops ball and runs to bench.

So it seems that A1 picked the ball up just for the purpose of slamming it on the floor. I think this is over the line. An orchestrated display, in my opinion, is that much worse than one that is totally spontaneous.