Missed re-touch of a base while retreating...

[rwest]

ASA SP

R1 on 1st. BR hits a single. R1 rounds second on his way to third but fails to touch the base. Outfield attempts to throw the runner out at 3rd but the ball goes into DBT.

Now when do we announce the award?

Do we give the runner time to go back to touch 2nd?

I believe the rule book says (don't have it with me, this is from memory) that the runner must be given an opportunity to complete his base running responsibilities.

Is part of his responsibilites going back to touch 2nd?

If I award the 2 bases can he go back to touch 2nd, then go to third and then home?

If I award the two bases and he does not go back to 2nd as soon as he touches third he can not retreat to 2nd, is that correct?

If he does not retreat to touch 2nd, then the defense must appeal the out, correct?

Thanks!
Randall