This knot is demonstrated as a "tugboat bowline" in a few online videos. It looks similar to what is known as a perfection knot or angler's knot but I think that there are differences. When tied, it looks like this:
I wonder if there are any disadvantages when compared to the traditional bowline. After bouncing on it a bunch with static line (in the photo is a little utility rope) it seems secure and unties easily, I suppose a stopper should be tied into the tail, though I witnessed no slippage. Do you see any safety reasons to avoid this knot in an SRT setting. I don't want to relive the Allen Dove incident of '09, so let me explain my curiosity. I don't need another rigging knot, and have no plans to use this or any other bowline for routine rope work. However, I relish the prospect of tying it like this one day and rappelling off of it for the sole purpose of terrorizing new caving companions.