Double Play

[Mass Ump]

R1 on 2B and R2 on 1B. B3 hits hard grounder to the SS and when the ball is fielded by the SS she goes to tag R1 on her way to 3B but R1 retreats back towards 2B. I called R1 out for running back towards 2B and R2 out because the ball reached 2B before R2 got there. My question I guess is can a runner on a force play retreat back to a base before there is any Put Out at a base.
I know the force play is out for any base further than where the first Put Out is made. For instance runners at 1B and 2B hard hit ball to SS, SS throws ball to 2B first that will then make a tag play in effect for 3B but a force at 1B.