When I was 12 I had the opportunity to get my first (and it ends up only) start as a pitcher. My mom went outside with me to help me practice the day before. Not having a proper catcher's glove, I was throwing it a bit too hard for her liking. She decided to stand in the lefty's batter box and hold the base in the strike zone with her right hand. I was mixing in curve balls, but having just learned the grip it moved less than my change up. It finally clicked and I threw one of my best curve balls in my life. It curved right into the back of her hand. It was not in a fist, but it was holding the plate with a firm grip. We went straight to the ER where they called it a boxer's break. The doctor believed she had punched something, but her hand was not even in a fist when it happened. To this day her right pinky is noticeably shorter than her left. So it is possible that Lucroy got hit with something in the back of his hand and the break wasn't caused by punching something.