Killian is a harsh and vicious Captain, known for his executions and cruel attitude toward people who harm him or his ship. He's the Captain so, of course, he's going to defend his ship.

That's what he thought he was doing when he first caught you. Bringing you aboard, prepared to kill the large fish that was near his ship. He's surprised when he's met with a mermaid.

A beautiful mermaid that caught his eye immediately. He removed the net and tried to calm her. He's not letting her go...