"Ah, good, good." Mattie could understand that. She'd been thinking about "stuff" too. Stuff being everything from the fever dreams, to how she'd keep clean water well-stocked, to what she'd do in the case that this guy snapped and tried to murder her. Despite her high guard around Nick, she thought it reasonable that his thought process was similar. 

His repeated "I'm fine" made her jump. It sounded as if he was trying to convince himself as well as her, and that made her even more nervous, to the point of mild chest pain. His suggestion to check out the restaurant seemed rushed and irrational and it made her neck tingle, but she didn't exactly have much to lose, she thought. Mattie was without a family now, without anyone but herself to protect and it seemed like anywhere she tried to go in terms of survival would be pointless, a dead end. 

She shook the thought from her head. There could be cans of non-perishables in there, and they'd come in a lot of handy. It'd also be dark, and harder to see any of the zombies in the case that they should be attacked. But it wasn't going to get any lighter outside, and the risk could prove to be worth the reward. 

Mattie took the knife out of her backpack and headed toward the entrance without answering. She didn't know why, but she felt a need to protect Nick.