Obstruction or interference

[gotblue?]

I would think that, in the specific example that was presented after the original post, in which the ball is hit to F4, and F6 and R2 collide, there is still obstruction, with R2 protected to 3B (automatic one base beyond last base legally obtained), but that nothing would be done after the play if R2 reaches 3B safely (delayed dead ball obstruction).