Elbow during live ball

[bigzilla]

So, a defensive player grabs rebound, chins ball, and pivots to look up court. In doing so, she plants elbow squarely in face of opponent, who was facing her but doing little other than watching, knocking her down. I called it a pc. Coach says "that's just good basketball. We teach chinning the ball." Should this have been incidental?

And regarding excessive, what about the over zealous rebounder who takes a couple of swings when all the opponents are already heading down court...no one was even pressuring her. Would you still call a violation when she was basically swinging at thin air? I didn't. Coach wanted it.