foul ball and runner does not return to previous bag

[cbfoulds]

Originally Posted by Rich Ives

There is no rule provision to call him out. It's actually the umpire's fault.

5.09 e) A foul ball is not caught; runners return. The umpire shall not put the ball in play until all runners have retouched their bases;

On reflection [and consultation of my rule books during a break at work], I agree with Rich that I was wrong about the appeal for an out. And I further agree that, if caught before the next pitch, R should be returned to his prior base, since U1 screwed the pooch by putting the ball in play before R had returned.
I continue to be unconvinced that this "do over" can happen AFTER TWO PITCHES.

Say the pitches are both strikes - Batter out, side retired: OOPS! do-over! R returns, B back to the plate to get those 2 pitches back .... I think not!