Could be a top rope setup, the two ropes could be two slings, whatever. Invariably in the past I have always had two ropes in the fulcrum crab(s) on top rope, and if natural anchors, coming form three substantial protections.
Ive read a couple of things on it to make me think this coaxial loading may be serious although personally I don't think so or I would probably have been injured by now.
just curiosity
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