How to tie a Double Butterfly Knot. Uses: It is useful anytime two non-collapsing clip-in points are required in the middle of a rope. A good example is when a line of hikers wish to hook on along the length of a shared rope. #knots #knot #rope #nudos #climbing #sailing #boating #technicalrescue #videooftheday ⚠ Note: Working with knots can be dangerous if you're not experienced. Incorrectly tied knots might fail under pressure, leading to accidents. If you're not an expert, take time to learn p