In 16-inch softball this shall be expanded to include any action that occurs from the time of the pitch until the ball is hit by the batter. During this time no runner may advance. Should the defensive team make an attempt to retire a runner who is off base on a pitch not hit by the batter, no other runners may advance during this attempt. Batter C does not hit the ball. The defensive team attempts to retire runner B, who has legally left first at the time of the pitch and advanced toward second.
Catcher throws to first base.
Runner B must immediately and directly return to first base. The pitcher shall take a position with both feet firmly on the ground and with one or both feet in contact with, but not off the side of the pitcher's plate. This position must be maintained at least one second and not more than ten seconds before starting the delivery. There shall be no stop or reversal of the forward motion. A legal pitch is delivered with an underhand motion at a moderate speed with a perceptible arc of at least six feet from the ground.