2 Part Technique - Pouncing into directly into dominant control from the hand-fight against a seated opponent is an important method to learn when passing against an agile butterfly guard. Dive your shoulder into his chest to knock him flat while you guide one arm along his side from his hip up to his armpit for the underhook, and the other arm pushing his knee down into half, then up onto an overhook for Over Under Control from Half Guard. If he blocks you from gaining the underhook for the Over Under Pass vs Half Guard, grab onto his collar and force his back to the mat, but this time crossing a knee against his thigh for the Knee Slide Pass vs Butterfly.