Arthur beats Fish Knight

Arthur goes with her, and he’s just sighing. He gets to the magical underwater kingdom and sees…. a giant blue knight with his armor, sword, shield, helmet, and horse were all part of his body. And Arthur looks just so unamused by this and goes “Hi. Whatever you’re doing. Stop. I don’t feel like killing you today.”
And the Fish Knight goes “You human! You can’t defeat me for I am a great warrior of the Faerie lands and I-”
And Arthur sighs and just beats the slag out of the guy while yelling “I. HATE. FAE. PLOTS!” Then, once the Fish Knight is dead, he turns to the other Fae and goes “You’re free. Leave me alone. Bye.” They leave and Arthur collapses into his wife’s lap while she floofs his hair.

Arthurian Myths Retold page 66-67