I recently witnessed a play I've never seen before. With a runner on third with no outs, the batter hits a fly ball to left field. The runner on third backs up along the third baseline ten to twenty feet into left field until he starts running towards homeplate, perfectly timing the left fielders catch with his foot tagging third (at full speed) for the tag up. The runner easily scored. The other team didn't appeal, probably because they didn't know what they would be appealing, and the run counted. Umpire looked confused himself.
I don't believe this breaks the baseline rule as it is written.... however it still seems to be breaking a rule somewhere. Or is this play legal and just not used or seen too much?
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