He feels horribly guilty. He wanted to help the girl, not make things worse for her. He's undeniably done that. But he hasn't a choice. He's not going to be able to sacrifice the energy for another light spell without ruining this further.

So he turns his attention away, figuring he at least ought to watch for the very monsters and ghosts he tried to warn her away from in the first place. Bare tree branches rustle with the cold wind, but other than that, he doesn't see anything. When he startles, it's only by her words, making him turn back to her.

"What? No! No, no, no. There's nothing wrong with Candles! Nothing at all!" His shoulders slump, and he exhales heavy. "Oh niña, I'm sorry. It's really not you, or your fault. In fact, you'll probably find this doesn't happen with anybody else. I'm just..." His mouth presses. "I got sick a long time ago. Very sick, until I got my own power. When I got it, I was less sick, but I still have to be careful. Like an allergy, but one that nobody else has. Still, if someone has an allergy, they're supposed to let people know, right? And I didn't tell you, so it's not your fault. Please don't feel bad. Or feel like you're bad. You're not. You seem like a sweet girl to me."