Had a similar problem in a game I was working by myself a number of years ago.
It was a local league thing to give a safe signal when you ruled a "no swing" even when you were the plate ump.
So, the coach says comes out and says, "I want another look at that play."
I thought for a moment, turned 180 degress and signaled safe/ no swing as I said, "No, she didn't swing."
After he got through laughing, we had a pretty good game.
