Batter picking up the ball

[chitownvet]

I find this forum to be exceptionally helpful all the time. I have one situation that happened recently in a men's league game that I hope that I made the proper call.

There are 2 outs, runners on 2nd and 3rd. The batter takes ball four as the pitch is in the dirt and deflects off the catchers shin guard a little ways down the first base line. I look to see if the runner on third is making a break for the plate, and he is moving towards the plate but not rapidly. The runner on second is moving the same towards third base. The catcher is moving swiftly to pick up the ball, and as he gets closer the batter/runner picks up the ball in an effort to throw it back to the pitcher. As the defensive team starts to squawk, I call the batter/runner out for interference to end the inning.

Was this the proper call?