i dunno about unsafe work practices:
in the audio of the video (prolly about 2/3 of the way through) it is explained that the regs permit free climbing in this situation. That it is faster, less tiring, and safer than clipping and unclipping. This, of course, is with a 30 pound gear bag hanging from a tether below you!
They do tether in to rest as you notice. I wonder, though, on the way back if they lower themselves on a rope or if they have to downclimb? My guess is downclimb.
one thing for sure though, it gives me a stomach ache just watching it!!!
ok back to work,
pete