Battojutsu (抜刀術), also referred to as Iaijutsu (居合術)
It looks like Japan has come up with this ancient tactic of theirs in this World Cup (and it worked so far).
This is one of the Japanese sword crafts (methods), characterized by pretending to submit to the opponent, then giving a deadly lightning slash.
![](https://i.postimg.cc/gcvP3fqr/Battojutsu.gif)