interference???

[slowballbaker]

Had this one today...Let's see what the umpires think...

A runnerR1 at 3rd base, one out...
Batter B1 hits a pop fly towards 3rd base.....
This is where it gets tricky..I think...

3rd baseman in playing about 5 to 10 feet in front of the bag. The R1 gets her lead down the line and even with the 3rd baseman on the pitch, the ball is then pop up towards 3rd base. 3rd baseman (F1) breaks in(misjudges it) then break back towards 3rd for the ball....But while doing so R1 retreats back to the bag. F1 and R1 are making contact with each other(pretty good contact) on top of 3rd base...
The ball landed just a foot from 3rd base but foul...Since there was contact the F1 was unable to catch the ball...
Is this interference on the R1?
Is R1 allow to return to the bag?
If R1 gets out of the way of F1 then its an easy double play because R1 would be unable to return to the bag and F1 will catch the ball while standing on top off 3rd base....
You make the call...Thanks