Mendez bros - taking the back from butterfly guard

watching guillermo's mendez videos, i realized this transition from open guard (butterfly guard) to back mount. It happends at minute 1:32. What do you think about it? i cant see where is he posting his hands when he moves his hips to side and makes the opponent fall down (its like he is pulling from somewhere).

http://www.youtube.com/watch?v=_PfxjvdYleM&NR=1

looks like he is attempting a regular butterfly sweep/take out the garbage sweep combination to his right, then switches to a duckunder on that same side when his opponents hand gets high and the opportunity presents itself. the opponent seems to have just place his weight down and forward on mendez's chest so when mendez hips out he continues to the mat. pretty standard moves used nicely in combination.

ttt

imbed

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damn that vid must be old.. they are both bb's now tho but gREAT ASS video of them:)

supersaiyan - damn that vid must be old.. they are both bb's now tho but gREAT ASS video of them:)


pretty sure its 2004. badass blue belts haha