Great for this without having to remove or feed the whole line thru the loop in the butterfly.
The bowline is easier to tie around another rope than is a butterfly, and the process is identical, with the loop formed around the other rope (the fall line) as the knot is tied.
If either knot is tied midline, then the entire working end needs to drawn through the knot as its formed. Hence there is no advantage to using the butterfly in this application.




