Ok so picture you walking up to a pre set tree.....you already have 550 cord or throw line ran up the tree, over a branch at hunting height, and back down to the base of the tree. Now say you have 30 feet of rope but your hunting height is 25 feet. What your going to do is tie the tag end of your climbing rope to one of the ends of the pre set 550 cord. Once secured, pull on the other piece of 550 cord that is secured to the tree and begin pulling your climbing rope up the tree. Before your figure eight gets out of reach, put the end of 550 that you are pulling in through the girth hitch and continue to pull. Now your girth hitched rope travels up the tree until it is securely hitched at hunting height. That's how you get away with carrying half the rope you actually need. One good practice is to secure a carabiner and recovery line to the girth hitch before pulling the rope up just in case something gets snagged and you can pull it back down if you have to. Hope that didn't come out as confusing as I think it did.....