There are few ways to win a sumo match. One of them is to outsmart your opponent and do the Henka sidestep. So the wrestler forces his opponent out of the dohyo.
Sumo must be a full-contact wrestling, but sometimes you don’t need ANY contact to win:
The Henka is very tricky way to be victorious.
It is a risky, but high reward dodge move.
This technique is real counter for someone, who is too aggressive and can’t control his body.