Lol, I didn't see the sweet the ATC belay style til just now.
I was more thinking that I guess you could climb a sandstone overhang for a while when it first started raining, but I still stand by my comment "Why risk it?"
Anyway, I really like that climb and I use tape gloves....
And on that slackline thing, I never slackline so I forgot how much you need to crank on the strap to get it to be stiff enough to slackline on. I was thinking like Zoso, it's just body weight. I'm not sure how much you tension those things, but it's a lot more than human body weight.