This question comes up a lot when I train new HS kids to work our local kids rec league. I tell them to think of it this way. If you are holding the ball on the court and you step on the line, you're OOB, therefore the line is OOB, not inbounds, so an inbounder can step on it all they want and they're still OOB.
They usually get it.
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Yom HaShoah
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