obake
An obake punch is like a ghost’s version of a karate chop, it’s super strong, super famous, and it got used by a bunch of anime guys before it became a thing in manga and tokusatsu.
He used the obake punch and knocked out three guys in one go, and it was just for fun.
The obake punch was so strong, it broke the wall and scared the whole neighborhood.
He said he learned the obake punch from a ghost, and I believe him because he punched through a door.