spoiler discussion

[percival]

I couldn't resist. Argh.

My hypothesis is: this is very much at the beginning of the book - maybe the third or fourth chapter. Harry has been attacked by the Dementors during the holidays, and has defended himself using a Patronus. (Underage magic in a life threatening situation.)

Meanwhile, a campaign is underway to frame disturbed and dangerous Harry as Cedric Diggory's murderer. (The hearing.)

Harry, at his wits' end, flees. Mrs. Weasley, powerful witch that she is, finds Harry and leads him to a house connected with the Slytherin dynasty, where Harry learns to fully unlock the power that Voldemort transferred to him that fateful night fourteen years ago.

Ron has gone for Hermione; seeing her with Krum was what it took to make him declare his love for her. Their banter in the excerpt sounds like that of a couple.