(Harry opening his present from Hermione...)
His heart gave a huge bound as he ripped back the paper and saw a sleek black leather case, with silver words stamped across it, reading Broomstick Servicing Kit.
I couldn't find the definition of "rip back" from any dictionaries. It might not be a fixed collocation. I might think "rip away" could probably fit for the context. What does it truly mean?