NFHS 4.7.2c

[bainsey]

Originally Posted by rsl

....B2 gives him a hip check and causes him to lose the ball out of bounds.

I don't see how this couldn't be anything but a blocking foul on B2.

I like to see this kind of contact through. That is, if A1 can play through the contact and pass B2, I'd rule legal (or a "play on," in a sense). However, if the contact causes A1 to violate, the onus goes to B2. Blocking foul.