That wasn't the third out

[jTheUmp]

9th grade game.

Runner on second, one out.
Batter strikes out on a foul tip.

Catcher rolls the ball back towards the pitchers mound. All members of Team B, thinking that there are three outs, start to jog back to their dugout. R2, between second and third, stands there, confused. Knowing that there are only 2 outs, I say nothing. Finally, Team A's 3rd-base coach yells to his runner "There's only 2 outs, get over here!"

R2 makes it safely to third, Team B freezes.

B coach comes out of the dugout, asks if that was the third out. I say "no coach, there are two outs. One on the foul tip a second ago, and the other one on the sacrifice bunt by the second batter in the inning." (It didn't help that it was an 8- or 9- run inning between the 1st and 2nd outs). Coach accepts this, and we play on.

My question: should I have done anything differently, perhaps by saying loudly "2 outs" as the Team B players started jogging off the field?