Ah....it's good to see Dumbles smacked down. Hmmm....what's the odds that the Aurors heard that Mistress Harkness was at Hogwarts and decided that there was a nest of dark wizards somewhere else that needed investigating? Fudge and his pet toad might have wanted to arrest her, but getting someone to actually try and do it is something else again. Will Hermione hack into Hogwarts' library? Come to think of it, Padma might be into the idea too. I liked seeing how Harry's father, the Patils, and the Grangers meshed. Will Mr. Stark make sure that Harry's friends have access to his mind protective device? After all, if Dumbles was willing to invade his mind he'd have no problem assulting children. Thanks for the chapter!
I think your suspicions about that Aurors might be valid...
Umbitch will get her chance in a few chapters.
No, she's not going to hack into the library (yet) The 'claw library hasn't been shown yet, nor has what Harry is going to do with it.