what to call? could not find in rulebook!

[mach3]

I agree that he is ok if play was not interrupted. If it was pitched to the next batter and than the runner would run back to first, I would call him out, since he tries to confuse the defence.

In that sence it makes a difference. If the action continues I would guess that the runner is not too smart, if he stood there for a pitch or two, he knows what he is doing and where he belongs.

But why did the Umpire wait until the tag to call the runner out? If re runs reverse to confuse, he is out immedeatly.