Clark nodded because he couldn't blame her. Perhaps he should have suggested that sort of thing sooner, but nothing to be done about it now. He'd just need to keep an eye and ear on everyone else as they continued to explore. At her question, he hesitated. He wasn't sure how to have this conversation, even, let alone here. It would be easier if she had already knew about him, but it didn't seem like she did. "I - I have some abilities that make me able to do things that others can't. I can hear from great distances and through things, and see that way too. And I'm - very fast as well."