By March, Dumbledore and Snape got a plan together. Dumbledore was cursed and dying, so Snape would cast the killing curse on the last day of school the 30th of June. They would stage Draco's death and he would then join the Order and use Glamour charms when out in the field. Granger and him would stay in one of the safe houses with Blaise, Luna, Theo and Pansy while Harry, Ron, and Remus Lupin went on the hunt for Horcrux's.