H.S. Slapping backboard GT

[Hawkeyes]

I'm a high school official 99% of the time right now, but have an occasional game with NCAA rules.
Working with two excellent officials that work 60/40 H.S. & NCAA.
4th quarter of a game with decent flow and I'm C on a secondary break.
A2 goes in for a layup and B4 misses the block and slaps the backboard so hard that the rims shakes and layup rolls out. I got nothing, but can feel the crowd's disapproval... My trail official comes flying in and is counting the bucket for a goal-tending violation.
My immediate instinct was: Crap - that's wrong and I need to go correct him...
My words would have been: "We either have to get a technical foul on this play or take back the goal tending?". I'm confident that the trail official was confident that he was right... so I did nothing and figured I'd settle it at the next timeout or post-game.
Next timeout; I tell both of them: "In H.S. that is a T or nothing." They both have a mixed look of: are you sure/I think you're right/oh crap.
BTW: I knew I was 100% right on this one and I showed them 10-4-4 post-game and we had no argument... these are excellent officials!
Q: Did I handle this correctly or should I have gone over and corrected my partner without him asking me for help?