Ah, so let me guess. Because Raph is wearing the armor, Leo doesn't reconize him at first. Until he takes off the helmet. But, Raph fights Leo anyway cuase of their history, and Raph gets in trouble for it. But, thats not the reason why he gets in trouble, the reason why is becuase he wanted to do things on his own. So he hides it from the others. And being the father that Splinter is, he didn't want Raph to well basicly act like Casey when it comes to fighting. I guess that talk he had with Raph on Movie one didn't get through. I might be right, I might br wrong. We will see...