"I don't need your pity--these wounds are from a battle won!" Seto responds sharply, before looking back at the shoreline, which had receded considerably. "You...why are you even here? Have you been looking for me? Do you realize how dangerous that is?"

It's like trying to lecture his brother! Honestly, what's this guy's problem?

"I'm a sea dragon! Do you know what a dragon is?!"

Clearly the human knows what a bleeding dragon is, but Seto does not realize his wounds are staining the sand beneath him.