not sure if I'm describing this properly, the 1/2 guard but with the other leg using a butterfly hook?
Anyway I've started playing with this lately, AND (plug) ordered Kesting's DVD yesterday. Is there some good competition footage showing some of the sweeps? I saw one with Leo Santos that was really awesome, but haven't found any others.
Rodrigo Medeiros covers this on his half-guard series as well
Gustavo Machado goes over it a good deal too.
where did you see the one with leo santos?
pitbull - it was a tournament video CBJJO? I think. sorry I don't remember the name. It was kind of crappy quality, but still alot of high level guys and Leo put on a display with that.
watch the first minute of this video..chris brennan has a nice half butterfly guard move on shaolin
edited because i forgot the link
http://www.youtube.com/watch?v=gHgM864A6mE
edited because you added the link.