The figure 9 prusiked to the ridge line is for attachment on the second tree.
The first one is just girth hitched... i.e. tail is run through the loop. On the other end, you need to have some way of pulling the ridge line tight. What it means to have the figure 9 prusiked to the line rather than attach it normally, is then you can slide the figure 9 anywhere along the ridge, easily.
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