Obstruction or nothing

[Manny A]

Originally Posted by DG

I don't rule obstruction unless the runner was actually obstructed.

In the original post I have obstruction because the runner was knocked to the ground and a play was made on him. I don't imagine the catcher would be throwing the ball down there except to make a play.

If the BR was rounding 1b and bumps into F3 but was not making an attempt to 2b, as he would not be on a clean single being returning to infield, I don't see obstruction there.

You need to reread the definition of Obstruction.

There's only one reason why a BR would round first base, and that's to possibly advance to second. Otherwise, they would just overrun the bag or stop on top of it. If the BR is hindered while rounding, that's Obstruction, plain and simple.