Passing lead runner

[Scottydog]

Strange but true and I am not sure of ruling.

Middle school scrimmage again High school team. Homeschool league with brothers on each team.

Runner on first (new MS player), older player hits a homerun. Then takes off around the bases and passes the lead runner without even noticing. Stops short of home plate after bench yells to him to wait for lead runner.

I was calling game (new this year to umiring and my son plays so it was a favor anyway). I was not sure what the call should be. Everyone agreed there should be an out (3rd out) and they changed sides. Since it was all in fun and a scrimmage, we made no deal about it.

Can someone give me guidance on this for real games. Part of my indecision is the ball is now GONE (homerun) so no quick throw back to a bag. We of course had other balls...