Not trolling. I'm just saying...
The book says no knee, no foot. Is this not a detraction from the foundation rule-set? It is. So...why add the knee and not the rest of the body? I'm just saying...
Seems like another FED safety/micro-interference rule intended to prevent batters from stepping into the path of the pitch or interfering with the catcher.
I read 12.1.4-a, second paragraph from the bottom of the page. It says nothing about the intent of that rule. All it says is eject the know-it-all's casting personal insults whenever possible.