Look at the last sentence in 7.01
7.01 -- A runner acquires the right to an unoccupied base when that runner touches it before being put out. The runner is then entitled to it until put out or forced to vacate it for another runner legally entitled to that base. If a runner legally acquires title to a base, and the pitcher assumes his/her pitching position, the runner may not return to a previously occupied base.
This is an automatic out according to J/R.
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