refresher on GT

[Adam]

Varsity level boys game yesterday and a situation came up. As I hope to move up in level, I realized I need to have this rule down pat; and I don't quite.
Is it goal tending if a player hits the ball after it hits the back board, even if it's still on its way up?
The game I had, it didn't matter as the ball was on its way down and was below rim level (shot was over), but it got me thinking.
What is the rule in NFHS?