Forgot about that bit. Yeah, that was definitely not in the book. In the book I think Dumbledore petrificus'es Harry and then throws the Invisibility Cloak over him, so he couldn't do anything no matter what. I guess I don't find it particularly OOC, since we know Snape was in fact trying to protect Harry all along, but it isn't particularly IN character for him to be that open about it either. it's a good example of why I rank the movies as less canon than the books.