BR retreats towards home plate. Legal?

[Justme561]

Originally Posted by MrUmpire

In the OP the batter/runner not has acquired legal title to a base.

I answered the 'what if' part of the OP where the BR retreats back to HP.

You're right, I should of added:

NCAA 7-11p:
A.R. 3—On a tag play between home plate and first base, a batter-runner may retreat toward home plate to evade a tag, but shall be declared out after touching or passing home plate, or leaving the base line. The ball remains live.

But my question about it being a serious question still stands. If you don't know the answer to the OP then maybe you shouldn't be out there officiating.