What is Russian systema fighting skill?

Systema is a modern Russian martial arts school founded by Mikhail Ryabko and Vladimir Vasilyev. Its martial arts prototype is the traditional Cossack martial arts. In particular, the content includes the breathing training of Orthodox monks. The practice method of Wushu is from the inside out. All explicit fighting techniques and moves are naturally generated in Systema, and there are no routines and postures in the teaching content. When the enemy is engaged, the practitioner responds according to the stimulation and oppression felt by the whole body and mind at the moment of engagement, without gestures or preparation. Many times, even the practitioners themselves can't predict what kind of reflex action will be produced, and the attackers can't predict it. Although it is called reflex action, it is not a random reaction, but is based on the body perception ability developed by Systema basic training. The offensive and defensive sides are seen by others as collusive performances, which can be confirmed by many videos on the Internet. Most clips are continuous, random and unedited. Because modern Russian Wushu is generally called "system" in Russia (just like China Wushu is called Kung Fu), Russian is система, and its pronunciation is similar to English "systema", so Russian "so-and-so system" is often wrongly written as "so-and-so system A" after it goes to the world. In Russia, another famous school with the same reputation as Mikhail, Kadochnikov System, has also been actively promoting to the outside world recently. Kadochnikov system is often mistakenly called Systema, and even at home, it is often mixed at will. In fact, the training concepts and methods of the two schools are almost completely opposite. Although its origin is the same as Systema, it has attracted wide attention because it abandons traditional martial arts and teaches martial arts directly through scientific physical analysis. Baidu Post Bar has Systema, right? Related discussions can go there.