Perhaps Hermione's calm had rubbed off on Harry, for he finally got his thoughts under control before they spiraled into chaos.
The warnings and reminders Su Er-no, Mr. Aibo-had given him when he singled him out in class came flooding back.
"How could I forget?!" Harry smacked his head hard. "You're right, Hermione. We should make sure Sirius is safe first."
Harry glanced around and noticed Ginny standing nearby, her expression slightly cold but concern lurking in her eyes. Only then did he realize what he had just done.
"Sorry, Ginny, I just..."
"It's all right." Ginny shook her head. From Hermione and Harry's conversation, she had more or less worked out what had happened. "If we're going to use the Patronus Charm, we'd better go somewhere else."
"Right, right." Harry let out a small breath of relief. "Come on, let's find an empty classroom now."
"The Room of Requirement," Ron suddenly put in. "It's the closest."
They agreed at once and immediately set off.
"Someone's in here?"
Someone was actually inside the Room of Requirement. Harry had wanted to find a different room, but the Room of Requirement refused to respond.
"Try the room for our Defence Against Dark Magic group," Ginny suggested.
Sure enough, once they used the right password, the door quietly appeared.
"Neville? Hannah? What are you doing here?" As soon as Harry entered, he was surprised to see two people standing in the middle of the room, facing each other with wands in hand.
Su Er couldn't help raising his eyebrows and turning his head in Hermione's arms-
*Er... if Hannah were replaced with Luna, the Department of Mysteries adventure group would be exactly the same as in the original. As for Hannah taking Luna's place, that was probably the butterfly effect, because Hannah and