So I tried 2 TC once years ago after Scott Adkins showed it. At the time, I tried without a leg loop and it didn't go well. I was a sweaty and tired mess by the time I was 6 feet off the ground.
I intend to try again with a leg loop, but there are a few things overall that I consider cons from what I've seen from the various videos.
Unless you have the tether handles, you have to put your fingers between the tether and the tree when advancing the tether. I'm not a fan of this when standing on the leg loop. Perhaps I won't feel as unstable when I try with a leg loop, but it is still a concern. I also hunt some larger and rough barked trees, which makes advancing the tether difficult in many cases. I'd like to figure out a way that you could introduce some rigidity to the rope so you could advance it one handed after loosening the girth hitch. However, that could present more of a safety risk if the tether has a tendency to stay open.
Finally, I see rappelling down as pretty much a necessity for ease and also should you need to make a rapid descent as the bee example above highlights. I have a GriGri+ that I use for SRT already, but the rope I use for SRT is 75 feet of 10.5 mm. The device accommodates down to 8.5 mm, so I could get a shorter length of 9mm or something to use. However, I tend to hunt the same parcels and try to pick trees ahead of time, so doing presets for SRT often makes more sense for me.
So I like the idea and I think there is a lot of potential there and appreciate the information you have shared. Yet, like every climbing method I've tried so far, I see some significant challenges and downsides.
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