"Why are you assuming I'm not human?" Zack asked as he fell into step beside her, passing up the chance to comment on the information she'd given him. He definitely didn't do the math to figure out her age. That required more mental gymnastics than he usually spent his time on. Zack was a great soldier, and intelligent in his own way, but school learning? Not his thing.
Although Zack was limping, he was making good time. He was tall, and in good enough shape that his wounded leg wasn't much of a hindrance. "I'm not some sort of ... I don't know. Alien. I'm not normal, but I am human."