Catcher throws ball & hits bat of batter walking off after strikeout.

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ASA! Runner on 1st, no outs. Batter strikes out and leaves box walking toward 1st base dugout. Catcher stands and throws ball back to pitcher striking the bat being held on shoulder of batter walking off.

I call dead ball out of instinct. Runner that was on 1st breaks for 2nd after seeing ball on the ground rolling about. I put runner back to 1st. Coach asks why and I tell him I called "dead ball". He's ok and we play on.

Afterward I'm thinking, I probably should not have called "dead ball" since defense is the one that screwed up the throw and allowed a situation where a runner could advance on the errant throw had it not been for my "dead ball" call.

Should I have kept my mouth shut?