What the H?

[Loudwhistle]

I had a funny one happen last week with the 5-6 tournament playoffs. A loose ball is going all over the court, with about half the players going down on the court, finally A1 gets control of the ball and is sitting on her rear trying to pass, a close opponent B1 gets bumped by his own teammate so hard from behind that B1 falls completely on A1 and the ball knocking the wind out of the A1, looked like a tackle, I called a push on B1, but it was totally B2's fault for knocking B1 into A1. Was that right?