Need your opinion

[bigsig]

Doing a JV game by myself, no outs. B1 on 2B, B2 on 1B. B3 hits a line drive to right field. B1 holds up on 2B to see if ball is caught, however B2 runs toward 2B. Ball is short hopped (not caught on fly) and RF throws to F4.

B1 stays on 2B!
B3 (BR) now on 1B
B2 is hung up between 1B & 2B
F4 (instead of tagging B1 and stepping on 2B for a double play, tries to tag B2 who now tries to return to 1B (which is occupied by BR).

I’m not sure I made the right call but when B2 turned and started to run back to 1B, I called interference, dead ball, B2 is out, leaving B1 on 2B and B3 on 1B. My thinking was that if a BR is out for interference if they reverse course while running to 1B from home that it must also be interference if they are forced to a base and attempt to return to a base which is legally occupied.

The coach argued that B2 had to be tagged to be out and the ball should have remained live.

Not a close game so just looking to get it right.