Moving Screen Question

[ATXCoach]

As I understand the NCAA rules (please let me know if NFHS is different), a moving screen is a common foul and not one where free throws would be awarded, even if the fouled team is in the bonus.

Here's the situation - I was a spectator at a sub-varsity game where Team A (offense) has the ball, Team A has committed more than 7 fouls, thus Team B is in the bonus situation. A1 is dribbling, A2 commits a moving screen on B1. The refs award one-and-one free throws to B1.

I think that this was an error. Clearly a flagrant foul was not called, so I do not understand why free throws were awarded.

If I am completely wrong, please educate me.