I'm betting:
The girls attempted a hit and run, and the rider followed to get address/insurance info.
Girls call Daddy, because that's what they've always done.
Daddy believes girls are innocent victims and arms himself to protect his babies.
Rider follows girls home, sees armed Daddy and drives on by.
Rider realizes he is in unfamiliar neighborhood and returns the same way he came into it, or returns to verify the address to make a police report.
Daddy lets emotion get the best of him.
Sad.
Who among us wouldn't follow a vehicle that hit us and didn't stop?