I don't do much fastpitch, but when I do, I work under ASA rules (with some local league modifications, etc.), but it sounds like the NSA made a case play out of your play. They've been known to be a little screwy with their interpretations. That's one reason a city nearby finally threw out NSA for both slow and fast pitch and switched to USSSA only for slow pitch and ASA only for fast pitch. The interpretations that come down from USSSA and ASA are consistent with the rules that are written, etc.