Once the batter walks, he is no longer a batter, and there needs to be intent in order for interference to be properly called. A 10 year old who can deliberately throw the bat in a way to be hit by the catcher's throw would be pretty good! Hard for me to justify an interference call here.
OBR 7.08 Any runner is out when--
(b) He intentionally interferes with a thrown ball; or hinders a fielder attempting to make a play on a batted ball;
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