Use of own backboard (not a try)

[HawkeyeCubP]

I pretty much agree with most comments so far. I'm just trying to reconcile the rules and the case play. Because this could conceivably happen in a boys' state playoff game in the near future (I see it happening unintended, with the thrower coming down because they don't handle the bounce from the backboard well), and I want to decide how I'd call it.

The only place my brain is finding any kind of solace is that, if possible, this live, loose ball exists outside the realm of a pass, try, dribble, or fumble.