Harry started at her exclamation, but almost smiled when she explained that she'd tripped. He could almost see it happening, even though with the Patronus, it could have been hours ago. He suddenly missed Tonks, quite a lot.
That feeling was replaced, quickly, with cold dread. Mr. Lovegood in Azkaban - how were they supposed to get him out of there? Harry kicked himself mentally for coming up with grandiose schemes to break into the Ministry and not thinking about the fact that obviously they'd want to put him in the hardest place to catch, ever.
He had to gather his thoughts, since Tonks was asking for his opinion. "I don't know how we'd manage it," he said, once he'd conjured his patronus and cast the spell. "But I think - I mean, we have to try, don't we? I just left him there when I saved Luna, it didn't even - I have to fix it. Do you have any ideas about how we could do something? I have to talk to the others, but the risk is worth it, to me. And to Luna, I'm sure. So..." He sighed. "I don't want to get you involved, Tonks. I mean, thank you for finding out where he is, but it was my mistake, and I'll fix it. If you have any ideas, though, I'd be really glad to hear them."