[Manny A]

Originally Posted by Chess Ref

In Fed, we can still have OBS, irregardless, if the runner could have made it back?

I don't think so, based upon this case play out of the FED case book:

8.4.3 SITUATION H: With R1 on second, B2 hits a fly ball that appears will fall in for a hit. However, F8 makes a spectacular catch. R1 is off with the hit, and (a) is obstructed while attempting to advance to third. She then realizes that the catch is made and attempts to return to second base and is tagged out; or (b) is near third when she realizes that the catch is made. As she attempts to return to second base, she is obstructed by F6 and is tagged out. RULING: In (a), R1 is out. She is not protected since the obstruction occurred while she was attempting to advance after leaving a base before a fly ball was first touched. In (b), F6 has committed obstruction. R1 will be awarded the base, in the umpire's judgment, she would have reached had there been no obstruction. (2-36; 5-1-3; 8-4-3b
Penalty a Exception 2)

Seems to me the ruling in (b) would allow for the out if the umpire judges that R1 would not have made it back safely to second base without the obstruction. So I think FED and ASA are in synch here.