Touching in reverse order...

[TussAgee11]

1 out, R1. Fly ball to RF caught. R1 has rounded 2nd and headed to third. Upon seeing the catch, he turns and runs directly back to 1st base across the cutout.

Obviously, we have a problem. The defense threw the ball to 2nd base and I signaled out. Offensive coach said that the only base they could touch to get him out was first, I replied they can touch any base previous to where the runner was at that time (i.e. if the ball beat him to 2nd, if he was running correctly in reverse, he's still be out).

But this can't be, because if we have multiple runners, then 2 outs could be recorded at the same base.

So, should I have waited for proper appeal on this, even though it was obvious to all that he never retouched 2nd?