Runner on 1st base, GB to the 2B

[BLB]

Situation: A runner on 1st base (R1) & a hard hit GB fielded by the 2B. R1 retreats back to 1st base for whatever reason. 2B throws to 1st base. The 1B gets the BR out then tags R1. I presume R1 is safe because the BR was call out before the tag?

 

[Eric F]

Correct. If F3 stepped on 1B to force out the BR, 1B is now available for R1. The correct sequence is tagging R1, then stepping on 1B.