Does the run count?

[IamMatt]

Let me see if I have this straight. It sounds like there is a consensus that R2 made it to 2B about the same time as the throw that was dropped (OP called it a bang-bang play), and that he touched the base. Sounds like there is consensus that he is safe at 2B due to the dropped ball by F4. Not stated in the OP but we might expect him to have been called safe. Therefore at this point, the force is no longer in place. Is that right so far?

Now, the only way the force can be reinstated (at least in the sitch provided) is for R2 to retreat towards 1B. Is that right?

If I am correct so far, then is the crux of the matter whether heading to the dugout is considered "retreating towards 1B?" If so then the force it reinstated and if not, he is simply liable to be put out the same as if he were safe at 2B then wandered off the base in any direction (as long as he is on the playing field)?