Watching this (and all the excellrnt videos you have forwarded) - Ju jitsu looks like Qinna - or an element of Qinna. Qinna - or 'Joint Relocation' as Master Chan referred to it in Hakka - emphasises breaking bones, dislocating and/or snapping joints, but only in its highest or most deadliest aspect. The Chinese language instructional texts talk of the 'grip' being developed so that 'skin' is torn-off and 'bones' shattered like glass!
a) Ju Jitsu (柔術) = 'Rou Shu' - or 'Soft Expertise/Art'. An ethnic Chinese speaker once explained the underlying concept behind the 'Rou' (柔) ideogram to me as 'to ride in another person's rickshaw' - which I thought was superb! Not just 'borrowing' - but if need be - 'stealing' another person's vehicle of transportation (or mode of 'movement') certainly with their knowledge (after-all, they are 'present'), but equally 'without their consent' (as the resulting outcome is often contrary to that desired by the opponent)!
b) Qin Na (擒拿) = 'Catch Relocate' (Probably 'Kin Na' in the Japanese language).
Working down from that level of destruction, there is the well-known 'controlling' of the opponent through 'light' joint relocation designed to 'move' the body around (from an 'inconvenient' place to a 'convenient' place), or to 'disarm' or 'subdue' whilst leaving the opponent or assailent relatively 'unharmed'. Indeed, what makes genuine Taijiquan so effective is its inner core of guiding Qinna. Coupled, of course, with the mastering of the dropped bodyweight through an aligned bone structure - and the efficient directing of the resulting 'rebounding' force from the ground to the extremities - a process which allows for the generation of tremendous 'breaking' force with apparently 'little' effort!
Whilst translating a Chinese language text into English regarding the fundamentals of traditional Chinese martial arts, I came across a Chinese ideogram used in the section to explain 'Qinna' (擒拿) - the art of 'capturing and holding' that I had recently read in a Chinese language article discussing the Goju Ryu Karate-Do practice of 'Kakie' (カキエ). This article had originally been written in the Japanese language by the grandson of Motobu Chaoji (本部朝基) and later rendered into Chinese script - which I could read! The two articles under discussion are as follows:
The 'Kakie' article is on this blog whilst the other article now forms a main section on this web-site. Mr Motobu reconstitutes the spelling of 'Kakie' as follows:
Regular Japanese Spelling: 'カキエ' (amongst many similar variants)
Reconstituted Spelling: '風け合い' (Kakiee)
Whereas Mr Motobu uses the Chinese ideogram '合' (He2) - which I also encountered within an in depth article discussing the 'gripping', 'tearing', 'dislocating' and 'hitting' of pressure points used within the very dangerous traditional Chinese martial art of 'Qinna'. In our gongfu system this is used to 'lock' joints and control assailants in the first instance. A step further is pushing into the 'locked' joint so that the bones and joints move in a contrary 'grating' manner - causing sprains, strains and recoverable joint damage. The next level is to apply enough 'sudden' pressure so that the joint structure is 'smashed' - usually beyond repair. Part of this 'catching' (which can also consist of a gentle deflection or diversion away) involves the finger tips 'pressing' powerfully into the pressure points - although the elbow, knee and edge of the thumb can also be used - as can parts of the feet. When 'training' to perfect the application of these devastating techniques - the 'distance' - between the practitioner and opponent must be 'closed' as quickly and efficiently as possible. Within 'Qinna' this is described within the Chinese language as expertly using the concept of '合' (He2)! Mastery of this concept requires the fast and efficient closing of the distance between the opponent and the practitioner - and the sudden diminishing of the space between the striking anatomical weapon and the targeted area of the opponent's body!
Shifu Adrian Chan-Wyles (b. 1967) - Lineage (Generational) Inheritor of the Ch'an Dao Hakka Gongfu System.