Ok. My son has started bowhunting and have bought safety lines for all the stands he will be hunting. I noticed that each muddy safety line (what u clip to while climbing up and down) has 2 prusik knots. The instructions mention it has 2 but doesnt say which you are supposed to use. Does anyone know? Is there 2 so 2 people can hunt together? A little confused. I wear a harness but have have always clipped in when i got in stand to a strap around tree, so this is new to me. Any help is appreciated!