He's always digging around in the levant over a thousand years ago when it was right here in English at both ends.
B is V.
Baccine (backseen or baxine)
Back seen - A 'back' was seen. Perhaps a human thief, running away?
Back scene - A memory?
Backs in - Part of that most hated of phrases 'Put your backs into it' ....the whip cracks!
Back sin - What is a position of sin which a missionary should never be in? Yes, doggy-style.
Could any of those have found their way into a small number of people's trauma encoded ancestral memories? Between this blog and C4A, we've now located over two dozen examples of traumatic past uses of the homonym in question.