A player, whose name is on the team’s batting order may not become a substitute runner for another member of the team. “Courtesy runner” is not permitted.
If the base coach base, by touching or holding the runner, physically assists the runner in returning to, or leaving the base, the runner is out and the ball is dead.
In Major Baseball and below, the pitcher is not required to come to a complete and discernible stop before delivering the pitch, whether there are runners on base, or not.