Little League minors game. R3, fly ball to the outfield, LF catches the ball and R3 tags and scores. The defense's coach is yelling for them to throw to 3rd and appeal that the runner left early. The runner hears this and sprints back to third. I called him safe, as he did indeed tag up. Should he stay at 3rd? Was he even allowed to run back to 3rd after already scoring?