Geas of Gryffindor

When Harry disrupts the spell to retrieve Sirius from the Veil, Ron and Draco find themselves in the middle of an ongoing war, forced to scramble and strategize as only they can. Elsewhere/when, Albus Dumbledore falls from the Astronomy Tower, Severus Snape is at wit's end, and a desperate Draco Malfoy receives help from an unlikely source. In other words, TAKE THAT, CANON.