Invisible Man or Ghost Runner?

Sue from Bloomsburg, Pennsylvania, wants help regarding a dispute with her husband about terms they use in a pickup sport like softball and you don’t have enough players to field a full-size team. If you get onto second base but then have to go back to take the next turn at bat, you say ghost runner on second or ghostie on second to indicate that there’s unseen runner on that base that’ll precede you if you manage to get on base again. Her husband, who’s from a different part of Pennsylvania, always called that imaginary placeholder an invisible man. Which is it? In The Dickson Baseball Dictionary (Bookshop|Amazon) by Paul Dickson includes ghost runner, invisible man, and imaginary runner. This is part of a complete episode.