From the video BCP shared I can confirm they where using two independent rope system one for each person my guess is 3:1. Probably using a setup like the illustration below which is called MPD (multipurpose device) which has a one way pully and built in friction brake. For rope rescue pulling by hand is the choice because of lift or descend accuracy, communications, controllability, dependability and versality. Every rescue need to have a fail safe (two rope on each person) with a mechanize system it would be a lot of gear. Their setup looks on par with ours.
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This is the kit we use,
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