when can you run on dropped third strike
On an uncaught third strike with no runner on first base or with two outs, the batter immediately becomes a runner. The strike is called, but the umpire does not call the batter out. The umpire may also signal that there is "no catch" of the pitch. The batter may then attempt to reach first base and must be tagged or forced out. With two outs and the bases loaded, the catcher who fails to catch the third strike may, upon picking up the ball, step on home plate for a force-out or make a throw to any other base in an effort to force out a runner.