The twenty feet (1/3) is a guide line and unless you are really fast you won't get that far when you see the ball going to 3b. If it is behind you, it won't be back there long since it will quickly get ahead on its way to 3b. Slower umpires, like myself, cant get 1/3 to 1b. It may be only ten feet when you see you have to bust toward third. Priority is to watch for the pulled foot and then get to third if the runner is advancing there. You will never be in a throwing lane and, actually, the ball will never be behind you since you are watching for the pulled foot.
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