Spectator interference at a critical point

[BillyMac]

This play really happened a few months ago. I have discussed it with several officials and cannot seem to get a clear intepretation. I posted it on this Forum a few months ago, but it didn't seem to generate a lot of interest, so I'll try again:

NFHS Rules. High school varsity game. Small, crowded gymnasium. Not much room outside the sidelines.

Point guard A1 passes to wing A2, who, unfortunately was making a V-cut toward the basket. I am the trail official and I know for sure that the ball will definitely go out of bounds on the sideline on the opposite side of the floor from me. My partner is the lead official and it's his sideline to cover. At that second, a fan, holding a hot dog from the concession stand, while trying to get back to his seat, while totally inbounds, both feet, on the playing surface, is struck by the ball which keeps it from going out of bounds. Player A2 comes back from his V-cut to pick up the loose ball and play continues. My partner and I were both dumb-founded, and allowed the play to continue with no whistle. No coaches complained. No parents complained.

Is there a call here? Is the fan treated like an offical on the court, as part of the floor? If a coach or substitute had been struck by a ball under the same circumstances, we could have called a technical foul for the coach being out of the coaching box or for a sixth player being on the floor.

Please cite an NFHS rule or case book reference. I am also willing to accept NCAA, FIBA, NBA, or WNBA citations. Help.