Abandonment
Little league game, majors. Home plate umpires ball/strike calls and mechanics aren't clear. Two outs and the count is 2-1, but the scoreboard says 1-2. Pitcher throws and the batter swings and misses. Defense thinks it's strike 3 and walks off the field. Catcher rolls the call to the pitchers mound. R2 and R3 start walking off the field too. R2 and R3 both start walking towards the 1st base dugout. R3 does not touch home plate.
As r3 is crossing the 1st baseline, the umpire yells out, that's strike 2. R3 and R2 start running back to their positions. The as pics up the ball and throws to 3B who clearly tags R3 out.
Umpire calls that they called a dead ball and everyone returned to their bases.
My question is what should the umpire have done? If offense and defense both leave are the runners just out for abandonment? Is it the umpires place to stop the game and clear up the confusion unsolicited?