Strange obstruction play

[yawetag]

OBS in Fed is ALWAYS delayed dead ball, so any action after the OBS is allowed. If R2 scores, it counts. The only thing OBS does is protect a runner to the base the umpire felt he would have obtained absent the OBS, with a minimum of one-base beyond the last-acquired base.

In this situation, it sounds like BR was OBS by F4 before he was able to reach 1B. Therefore, he can be protected farther than 1B, but you have to give him at least 1B. Since F9 was able to field the ball and tag BR before he touched 1B, I'm going to assume the BR would have never made it to 2B in a non-OBS situation. If so, award BR 1B and let the run score (or whatever else R2 did).