Excellent post. If this had happened when I was on the field, I'm sure I would have been stumped. But I hope only momentarily. Thanks to everyone's input, I hope I will be ready if it ever happens to me.
Now I will know to do the following:
1. Make sure I watch for the lookback rule violation.
2. Do exactly as Tom did and stand a few feet up the line toward 1st with my arm pumping fair.
3. Keep my mouth shut and let my partner on the bases call safe or out.