Cavern had no idea how to even approach people. He was cowardly, a bit of a crybaby, and a true weakling, but he did wants friends. It's just- he couldn't bring himself to open his mouth and speak.

Pitying the poor fish-boy, you approached him as he sits in the corner of the classroom, reading a novel.

"Ah! Um! I-I'm sorry, I didn't see you coming-" stammers Cavern, heavily embarrassed. Poor guy.