Check out this link:

https://youtu.be/0wupL8dPTzw

This method of tying the Alpine Butterfly does not seem to be widely known, but it has advantages over the traditional methods:

1) speed
2) easily tied with rope weight below you
3) easy to make large loops

I thought I had discovered it, but it turns out it has been known to some UK arborist since as far back as 1998, and according to one, is "well known" in mountaineering circles. I'm curious to know if anyone here has seen this method before.

cheers
andy

I've always done it this way, but this does look faster and I like that it's easier to make bigger loops (although I don't remember having a need for a bigger loop).