Klaus nods slightly when she concludes, 'Okay, if that's what she said,' because it is, and even if he wanted to, he couldn't help Amy. At least, not without his full set of powers. If she really is full of holes, he could easily go explore her dreamscape, at peak strength, and maybe find out more for her.

If he cared to.

Honestly, if he had his full set of powers, he might be happy enough to give it a try.

"Thanks for the pick-me-up," he answers, because while he doesn't see it as her saving his life, it was still something. After everything Lauren and her little posse must've told her about him, it's worth at least a thank-you. It also calls for another question. "Why didn't you take the vervain?"