In yesterday's Birkenhead v Central game... Central were hot on attack and looking dangerous. A ball trickled onto the field back near half way from the game being played on the field next door, so a canny Birko player hoofed it towards the Birko goal. Officials didn't appear to see where it came from, probably assumed it had come straight from the other field and stopped play given there were two balls on the pitch.
Question: What woud have happenned if one of the officials had spotted what actually happenned? What would the penalty have been for the Birko player, if any?