Ron's question earned a strangled laugh from Harry, who rolled his eyes. It was about as daft as anything he might have said. "You can't get much further away than Australia," he answered, watching Hermione lean against Ron.
The implication of her statement wasn't lost on Harry, and he flushed. "Yeah. Okay." They could help. When it came time to go. . . well, Harry'd worry about that then. Who knows, Dumbledore had just threw it on him at the last minute, last time. Maybe that was how it would go again and Harry wouldn't even have a chance to try to keep his friends from running into possible death alongside him.
The fact that he gave in was probably suspicious - Harry could be as stubborn as either of them, when he wanted to be. Once he got a notion in his head, he never quite let go of it. (Which was just proved by the fact that he was STILL convinced Draco Malfoy had been up to more than he'd found out about, last year.) Harry gave her a wan smile. "Where did you even LEARN the spells to do that, anyway?"