Double foul and shot clock horn

[Scrapper1]

This is a question from the NCAA test. We went over it and over last night, but without a real resolution.

A1 releases a try. B2 and A2 foul each other. The shot clock horn sounds. A1's try fails to hit the rim. Enforce the fouls and then what?

Go to the arrow?
Penalize the shot clock violation?

Since the whistle blew for the double foul, the shot clock should not have sounded, even though the ball remains live. That leads me to believe that we go to the arrow.

Others thought that since the ball is live and the shot clock horn did sound, you have a violation, and the POI is the penalty for the violation.

I looked through the case book and couldn't find a real match to the situation. Anybody have a clear reference?