Is there a mechanic for this ?

[Chess Ref]

ASA rules, 12U, decent teams, 1 man system. Its a friendly tourney so free wheeling subs etc . 1 man was enough for these games.

I had a couple of things break out on this particular play . So I'll make 2 or 3 threads of this play.

R2 on 3B, R1 on 2B, ball four to batter thats gets away from catcher.

R1 bolts on seeing ball get away. R2 and R1 both end up on 3B. F5 gets the ball from the catcher and tags both runners. I have R1 as now being out.

Is there something i could say or do that lets everybody know which runner I have an out on ?

I called an out but quite frankly everyone but me seemed to be confused to which runner I had out.

I'm hoping I haven't missed the painfully obvious.

Thoughts ?