Interesting piece of kit. What I have always done is tied the sharp end of my DRT system in a running bowline around the working side, thus providing a choking system, then either tying a double overhand or using the splice and inserting a carabiner, running the brake hand side of the rope up into the carabiner to allow decent on a single strand and the system is retrievable from the spar.
I hate to say it years of climbing a tree, i just now used a choking friction saver for DRT. Cant believe i use to just spike and lanyard spars, kind of ignorant. Full believer in it now.
This could have been a good video BUT - *NOTHING was visible.All I saw was rope flapping around and heard klink klink.The second demo was a little better but you guys are NOT teachers! Next time check the video - can all actions be seen or not otherwise it is a waste of time.