Its possible that the solution will have multiple steps, such as:

1) Stall for time by giving information on useful powers

2) Demand that vow requires Hermione is awakened so Harry can discuss the probability of him ending the world.

3) Hermione causes a distraction by slitting her wrists and running round shouting "Look at me! I'm bleeding silver blood everywhere but I'm not dying! How can it be?"

4) Harry triggers resonance cascade

5) Harry transfigures weapon

6) Harry kills everyone

7) Harry, badly wounded, drinks Hermione's unicorn blood to save him from death, killing Hermione in the process

8) Hermione comes back from the dead because of the Horocrux

9) Hermione uses the philosophers stone to permanently transfigure them both into unicorns

10) HPMOR turns into Harry Potter/MLP:FiM crossover fanfiction

Now, my question is this: does one review have to get every step absolutely correct? Or is it ok if ten reviews each get one step correct? What if a review starts "first stall for time - many other people have submitted excellent ideas for this, which I shall defer to."?