It was entirely possible that Oko was getting in way over his head here. He didn't know anything about this guy, and he didn't know anything about the fog. Oh, and nobody knew where he was. His dad was probably back home freaking out, wondering where he had gone. He still felt bad about that, but not enough not to leave anyway.
"Sure do! My name's Oko, by the way." He considered holding out his hand to shake, but he wasn't sure how that would go down, so he kept it to himself. In his mind he had just recruited a super strong teammate, and he was feeling rather proud of that fact.