Mechanic on odd play

[mcrowder]

Tie game, bases loaded, time has expired, home team batting, 2 outs. 12U

Batter is walked.

ALL THREE RUNNERS sprint to near the pitchers mound to begin a line (apparently, being in the front of the line to shake hands with the other team is something this team has drilled - they were QUICK). (BR did actually make it to first, and ended up last in line for the handshake)

I'm standing at home, dumbfounded. Catcher returned the ball to the pitcher, who begins crying and stays on the mound. The rest of the infield heads off slowly.

I can't yell "Ballgame!" until someone scores, right? I can't score the run until someone A) touches home, or B) defense ("all infielders", according to the book) leave the field. I can't call her out for abandonment until she leaves the field of play.

I stand there dumbfounded. My BU stands in C, mouth agape, in stunned silence.

What do YOU do?