Thanks for the video on the OPI play. Looks like the foul was on the B's key (second receiver from the sideline) about 3 yards downfield from the LOS. In that case, it was almost certainly B's flag (and he'd be standing on the end line, 26 yards from the LOS). So B has to throw the flag, and then ask H where the pass was caught.
If the H said it was behind the LOS... B picks up his flag, and H gets a downgrade.
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