If he wasn't already feeling so worn out, he might have put more weight and assurance behind his reply, but as it is he just wants to get away from the subject (namely him) as soon as possible.

She doesn't have to wait for long before he's standing on his tiptoes and pushing the up button. There's a certain kind of satisfaction to be found by hitting buttons, he's discovered, and the risk of anything terrible happening when pushing one isn't as likely here as back home with the Science Division. He glances back to her as he lowers himself down onto his heels, blinking as if she said something weird. "I don't think there's anythin' wrong with nosy. I'd say curiosity makes the world go round."

Although a certain tiredness is seeping into his voice (excitement from before finally catching up with him) it also holds sincerity and he shrugs casually at her words of thanks.

"I'm just saying how it is, you're very kind."