by chenyaolong on Sat Oct 07, 2017 7:42 am
sorry for the slow response
the naming is lineage specific..... seven star mantis calls this kick simply Liao Yin Jiao (lifting the Yin kick), lineages in Taiwan tend to call it Bi Men Jiao as you said. However in mainland Taiji/Meihua Mantis, Yuan Yang Jiao refers to this kick for the reasons I mentioned in the video.
On a sidenote, we also have a Bi Men Jiao although it is a different kick.
The naming of techniques in Mantis tends to be confusing, I think this is due to techniques being absorbed from other systems, and then being adapted and changed over time, with the original meaning becoming obscured. Yuan Yang Jiao seems to have been an actual system of which certain techniques and ideas went into Mantis, as it is listed in manuscripts as one of the 18 ancestors of our system.