over rule or not

[cb33]

I was working as the BU when PU declared dead ball after batter was hit by pitch. The pitch struck the ground before hitting the batter and the PU did not award the batter first base. This was a game between 12 year old teams, and neither coach said anything about the call. As BU should I have over ruled and overturned the PU's call and awarded batter first base? I was told the PU was experienced so I wasn't sure what his reaction would have been if I had done this. My goal is to get the call right.