Is inadvertant contact on a force still interference?

[scarolinablue]

Sitch: I'm BU in the "C". Bases loaded, one out. Grounder to F4 who relays to F6 to start the DP. As F6 is coming across the bag, he catches the throw which is a little behind him. After he has made the force and is transferring to throw to first, he contacts R1, who did not slide, but also did nothing intentional - merely ran straight to the base and did not overrun the base. As a result of the contact, the ball comes loose and no throw was made to first.

As my partner nor I saw anything intentional in the runner's actions, and he did nothing illegal, he did not call interference and get the DP. Defensive coach wants the DP, as would have ended the game. Partner and I get together, and we agree there was nothing intentional and we played on.

Am I overthinking this now...does the fact he is now a retired runner negate the fact that it was incidental contact, and since the contact did alter the play, we should have gotten the DP? Again, he did nothing illegal, but ran straight to the base without overrunning the base.

The two runs that scored tied the game. Defensive team ended up winning the game in B7 on a wild throw from the pitcher to the catcher on a bases-loaded dribbler, trying for the force at home.