depends on other's reacts
https://youtu.be/wr-6 wwt8 RXk? si=waABg5 cJmfZI2 i-6
1:19 He hides his arms behind his back, this is very unusual. Any countries, at the (first or intense) sight, man needs to show their hands like shaking or embracing something like that because man must show no weapon (means I don't want to fight) to another man. But in China, this kind of unusual act seems to be on the path of communications. His next movement (like a hidden weapon or a fist) depends on another man's behaviors. Not deciding yet before what another man does for next.
So even now any countries don't like <man puts his hands in his pockets> because another man can't see what he has in his pocket. So all say "Put your hands up (Sometimes for fun) or arrest!" in front of a unknown man looks like unstable.