This guy is not human. Every time sword savant Isao Machii comes up with a new stunt, it only adds to the ever-mounting evidence that he is a time-traveling samurai and/or an alien robot sent to destroy us all. Machii has done nothing to dispel this myth, as recently he chopped a baseball going 100 miles per hour. It comes at about ~24 seconds into that video. It's pretty easy to miss it, but Kotaku finagled a pretty sweet slow-mo GIF of the action:

There's a whole rabbit hole of Machii madness to go down if you'd like to be in a state of awe for the next six hours. Here he is cutting an iron pipe: