tominator,
You are correct that the R1 legally stole 2B on the foul tip and could have legally remained at 2B.
However, there is no rule preventing him from returning to 1B, as long as he does so before the pitcher is set to throw a subsequent pitch. (In that case, he would be out under the OBR 7.01 Comment. The BRD points out that this is a "point not covered" under FED rules, and recommends treating as in OBR.)
Once he reaches 1B, he has once again "legally acquired" it since no other runner has a "senior claim" to that base. Therefore, his contact with 1B affords him protection from being tagged out.
JM
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