Batter is out on the third pitch, catcher is not required to catch the ball. Batter may not bunt or chop down on a pitched ball. Batter is out, illegal hit. All other home runs after the second will be an out. Base runner may leave base only after the ball has passed home plate, no lead off or base stealing.
Base runner is out.
Overthrow - On an overthrow at first, third, or home base, all base runners advance at their own risk. Runners MAY NOT advance more than one base on an overthrow. Overthrows in fair territory - runner advances as far as possible. Overthrows in dead ball territory - runner advances one base. NO Base Stealing and Sliding is NOT allowed.