[varefump]

R3 on 3rd, one out. The first pitch to right-handed B4 is in the dirt and gets by the catcher and ends up behind the right-handed batter’s box. As R3 races home, B4, while backing out of the box to avoid the possible play at the plate, inadvertently:
a. Kicks the ball away from F2
b. Falls over F2
In both cases, R3 scores easily.
What, if any, call needs to be made?