I don't have the book handy either, but the ball is OOB because it struck B1.
Consider this: B1 dives from inbounds to OOB (without touching OOB) to save a ball, good play. But, if B1 isn't watching closely enough and steps on the OOB line then dives. OOB on B, right? Because B1 caused the ball to be OOB by touching it after establishing an OOB position.
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