I wasn't going to wade back into this thread, but I can't resist a semantics discussion. You posted the rule here, but I'm not sure you yourself read it. The first and salient part of the description is "leading with his knee." You were quoting someone that said it wasn't kneeing because he didn't lead with his knee, but with his foot. His leg was straight. You apparently thought that the rule doesn't support that, but it's right there as plain as day. You bolded the clause that comes after that part of the rule, but the conjunction between them is "and," not "or." So kneeing is when a player leads with his knee. Sometimes, that means out to the side, sometimes it means straight in front of the player. But always leading with the knee. Looking up the rules and posting them is great, and helps the discussion. But do make the effort to read every word before jumping to conclusions.