IMO the word abnormal complicated everything.
Stepping back after the catcher has the pitch, even if the batter is still in the box, is very normal, but he is still responsible for his movements as to not interfere. So any normal movement would still be considered interference.
Which I think Matt was trying to emphasize.
As most have said, you'll know it when you see it!
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"A picture is worth a thousand words".
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