[UmpTTS43]

This "flying start" concept only applies when it is used as a way to tag and advance on a caught fly ball. If the runner uses a "flying start" but does not advance to the next base and returns to his original base, there is no infraction and this cannot be appealed. If the runner started with a "flying start", advanced a bit, returned and retagged, this would be legal and he would not be subject to be called out on appeal.

As far as the coach swatting you on the butt at the time the fly ball was caught, or on first touch, this is coach assist and the runner is to be called out regardless if the runner advanced or not.