Look Back Rule

[Big Kahuna]

I think this has been discussed before, if so, I would appreciate it if someone could direct me to the thread.

R3, BR gets a base on balls. On the pitch, R3 has moved down the line about 4 steps towards home, and is just standing there. Ball is returned to the pitcher who is standing just inside the home plate side of the circle where she is watching R3 and the BR advance to first. So far so good, no LBR in effect until the BR reaches first. BR gets to first, never checks up and goes straight to 2nd, where she stops and stands on the base. R3 is still a couple of steps off the bag, watches BR go to second and as she approaches second, R3 walks back to third and steps on it. The rule book and case book are clear that the LBR is not in effect until BR reaches first, but if the BR is advancing, is this considered a play, or is R3 out on the LBR?