In looking up the official mechanics for stopping the clock on a held ball, I ran across these little gems:
2.4.1.A.2 Typically an official should call violations in his/her PCA, but any violation observed should be called.
2.4.2.A.2 Typically an official should call fouls in his/her PCA, but any foul observed should be called.
So now I can point to the officials manual to back me up when I go fishing in my partner's pond.