Obstruction

[Tru_in_Blu]

From the OP: "The ball is released well before the runner contacts F6."

I'm reading that as a couple of seconds, maybe three seconds, after F6 made the throw to F5. So in theory, unless F6 floated a high throw to F5, R2 would likely be out by the time contact occurred. If she's out, she can't be OBS'd, but she could still INT (not saying she did in this case).

Had the runner arrived 2 seconds earlier and run into F6 as she was making the throw, we'd likely have INT (or possibly an out on a tag if F6 realized the runner was actually that close).