¡°Good,¡± said Professor Lupin. ¡°Very good. But that was the easy part, I'm afraid. You see, the word alone is not enough. And this is where you come in, Neville.¡±
Harry felt a nasty pang of guilt. He had completely forgotten that Buckbeak's trial was so near, and judging by the uneasy look on Ron's face, he had too. They had also forgotten their promise about helping him prepare Buckbeak's defense; the arrival of the Firebolt had driven it clean out of their minds.
¡°Well, isn't it obvious?¡± said Hermione, with a look of maddening superiority.
Snape seized the branch Lupin had used to freeze the tree, prodded the knot, and vanished from view as he put on the cloak.