Strange One

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Doing a Junior LL (13-14) game last night. Left hand slapper at the plate. One umpire. I’m in the slot. Pitch way inside but batter swings (strike 3) and ball hits my ball bag, knocking out other game ball. Now there are 2 balls behind the catcher. She picks one up and throws the BR out at 1B. (I have no idea wither it was the one in play or not). Coach comes out to argue that I should have called a dead ball (and of course awarded his BR 1B). I told him she picked up the right ball, end of discussion. But it brings up an interesting scenario. What’s the correct ruling on something like this?