::wicked chuckle:: Neither the Order nor Tommy-boy and his "merry men" are going to appreciate the results of this "learning experience". It should be quite interesting to see what Harry found in that book. Meanwhile, I rather suspect his improved skill with a sword is going to help matters with and for the Warlocks. On top of all this, Harry is making firm friends in a lot of unusual places and that is bound to cause the Order heartburn at a later date; likely Tommy-boy, too.
I love the slowly developing level of intimacy between Harry & Hermione and I suspect the final result is going to pleasantly shock and surprise both of them.