[JRutledge]

As a general rule, a pitcher can faint towards all bases except first without disengaging. So there is nothing illegal about fainting towards second base, then running towards second as long as the pitcher entire move was in the direction of second base. The only way this would be illegal is if second base was not occupied and no play was being made there.

I guess then I would have to see the play to determine if anything illegal took place. But I guess I would have to see what you mean by "running down a runner."

Peace