Just got back to my books and found this in Zhao Zhenzhong's 趙振忠 "72 Hidden Legs of Bagua" 八卦七十二暗腿
Bat Lands on the Ground
A steps up with his left foot, extending his right palm to push B's chest. B advances his right foot between A's legs, the left step following a half-step, and delivers a cutting strike with his right palm to the inside of A's right elbow, and then turns his palm over (so the center of the palm faces upward) and attacks A's face with a throwing palm. A uses his left or right hand to block B's forearm. B then steps his left leg behind his right leg, and his right arm rolls and sinks down to A's abdomen. With the right forearm, he presses downward on A's belly or hips, at the same time sitting his down on A's left leg, pushing A backwards.