 This young gentleman did not know that, even though by his skills and athleticism, I assume he's played quite a bit of baseball before. But somewhere along the way, apparently he was not told or just didn't know you can't step on the plate when you swing. I hated making the call in that moment, doing it to a kid who probably top to bottom was the best player on the field at the time. I didn't apologize for it. It's a rule. It may not be one other umpires watch closely for.