OBS case(s)

[youngump]

Originally Posted by CecilOne

OK, another case:
Runners on 1st and 2nd, base hit to LF.
R1 going to 3rd, making wide turn but collides with F5 barely before reaching 3rd. OBS called.
R1 continues toward home, LF throws to catcher, R1 tagged out 15 – 20 feet before home.

Is there any reason, with regard to the OBS, to nullify the out?
For example, R1’s path looked like an attempt to score and the OBS impeded.

Two possibilities. One if he would have scored absent the obstruction. HTBT, but I'm guessing you're implying no. Second, if a runner is bumped before a base and as a result falls or stumbles past the base, then HTBT, but I'm likely determining that they were obstructed both before and after the base and have them protected on both sides of the bag.
The rulebook isn't super clear on the latter but we've had discussions to this effect here before. It basically comes down to where the obstruction occurred in your judgment and in my mind I tend to judge that it occurred over the space the runner was actively hindered.
Note, you need this interpretation if you have this situation: Runner going to first with no shot at second trips over the inattentive F3 and is now lying between 1st and 2nd where she is tagged.