Batter interference

[NickG]

Wearing my LL coach's hat on this play (10/11): Our opponents have R3 and then a marginal pitch is mishandled by our F2 and the ball rolls off to his left, behind the batter. B/R sees R3 breaking for home and starts backing out of the box to get out of the way; at the same time, F2 is going for the ball. In moving to get out of the way, however, the B/R kicks the ball (at least once, but maybe even twice) knocking the ball out of F2's reach. It was not intentional, but rather a result of his shuffling quickly backward out of the box while the ball, unfortunately, rolled right behind him.

Runner scores, ump is silent. I ask for interference, but the ump shakes his head. I let it go (because I'm an ump myself).

To me, this is a no-brainer interference call -- 7.09(a). Or am I missing something?