Friend initially shared this and it had me stumped. Quite overkill me thinks
To be more precise, it's a sort of "double" sheet bend
--it has an extra turn, but is tucked not either twice under
the initial turn or under both turns--,
with each tail knotted with mirror-imaged strangle knots
Yes, overkill or some want of lonnnng tails (tied up) or ... !?