Harry Potter and the Prisoner of Azkaban
How we cite our quotes:
"No!" said Hermione. "If we steal [Buckbeak] now, those Committee people will think Hagrid set him free! We've got to wait until they've seen he's tied outside!"
"That's going to give us about sixty seconds," said Harry. This was starting to seem impossible. (21.139-40)
We really enjoyed reading about Harry and Hermione working together during the time travel adventure chapter. Hermione brings the logic and the attention to detail (and time) here; Harry puts the plan into action, like Jack Bauer racing against the clock.
Harry watched the grass flatten in patches all around the cabin and heard three pairs of feet retreating. He, Ron, and Hermione had gone [...] but the Harry and Hermione hidden in the trees could now hear what was happening inside the cabin through the back door. (21.161)
A huge part of the time travel adventure is the idea of perception. Going through things the second time around, Harry and Hermione see and hear and learn things that they hadn't initially. This is really fitting since the entire novel is about dealing with the past – by revisiting it, you learn new things and can then put it all aside and move on.
"How can you stand this?" he asked Hermione fiercely. "Just standing here and watching it happen?" He hesitated. "I'm going to grab the cloak!"
Hermione seized the back of Harry's robes not a moment too soon. Just then they heard a burst of song. It was Hagrid, making his way up to the castle. (21.225-227)
Harry and Hermione engage in the classic debate of whether or not you would, or should, change time if you had the chance. The novel itself seems to agree with Hermione here, given the close call with Hagrid.