Japanese sword master Isao Machii cuts a baseball in half as it travels toward him at 100 miles per hour. In my years of studying the sword, no one at our dojo ever thought of doing this.
So he lets two balls go by, as he judges their speed and arc of flight, and when No. 3 comes out, in one motion he draws his sword from the sheathe and cleanly cuts the ball in half.
Gee, I’d like to try that! My technique’s a little rusty, though, so maybe I’d better not.
Meanwhile, this adds a whole new dimension to the term, “a cut fastball.”