Over the back, ON the back RM article

[Amesman]

A bit related, but not ... just for confirmation:

What would you have if A1 drives the lane, takes off with a forward-jumping bank shot and plows into stationary B2, who for some reason while guarding A2 on the wing is totally oblivious to the drive? B2 is not in LGP but rather perpendicular/sideways to A1.

Book-learning says it's a block (right?), but common sense seems to say B2 was there by her innocent self first and A1 should have avoided the contact.