When the offense figured it out...

[JBrew32]

I apologize in advance for the long post...

R1, R2, R3, 1 out. Batter hits a sharp one hop that hooks inside the 3B bag. F5, much to his surprise comes up with the ball and attempts to tag R3 who is diving back to the 3B bag. F5 does not tag the runner, but steps on the bag. My partner correctly calls R2 out on the force. F5 for some reason chases R2 back toward 2B and catch R2, who is already out in a rundown. My partner is still signaling out and verbalizing "He is out, He is out". R2 stops, and is tagged by F6. F6, believing the third out has been made, rolls the ball to the mound and leaves the field with the rest of his team AS WELL AS the offense, who also believes the third out has been made. The offensive coach realizes there are only 2 outs, but not until all of his players are in the dugout. All of the defensive players were in their dugout as well. As the offensive coach runs out to argue the fact that there were only 2 outs, we tell him unfortunately all of the players have left the field and the half inning is effectively over. Whew...

My question is this: At what point could the offense coach realized the mistake and rightly returned his runners to the field??? The offensive coach took our explanation with a grin and indicated he "should have been a little quicker on the draw."