There are occasions where a Blakes hitch will lock-up with a heavy climber. This illustration is exploring a possible counter measure. The blue loop is in a strategic spot to facilitate an easier descent. It hasn't been thoroughly tested. This serves to review it and gain experience with it.
I'm evaluating the Palomar knot as a climbing knot. There are reports of it being a strong knot. It's a bight of rope that makes an overhand knot. Once at that stage, the loop (1) sticking out is pull back on the overhand knot. A carabiner captures the doubled rope at the (3) position.
Here are the beneficial features: a) doubled rope b) no sharp radius turns c) easy to unload d) has an unique shape and ease of inspection.
Questions: i) OK for terminal use ii) to what degree has it been used and tested in the climbing worlds iii) as a mid-line attachment, is it stable (thinking about the two strands at different angles)
The Slip Knot Dilemma:
A common practice is to use a slip knot to back-up a new climber. There are two outcomes to tying a slip knot. One can capture the climber's leg and make rescue problematic. The other slip knot can't form a cinch.
In this illustration, the top slip knot is a problem. The bottom one is OK. Tie them and place them on your foot and pull. The top knot will cinch while the bottom knot doesn't.
The Fatal Buntline:
If a carabiner is clipped into each of the buntlines, the one on the right will slide off the end of the rope and fail. By definition, the one on the right is a buntline, yet its use has a potentially fatal outcome.
There's a similar problem with the scaffold hitch.