Yvain oneshots Kay

They marry, and there is much celebrating. But Yvain hasn’t returned to Camelot, so Arthur, Kay and them go visit the magic storm spring. They get there, and someone reports to Yvain what’s up, so Yvain goes to protect his new spring. Kay sees a strange knight running towards Arthur and goes “Oh no you don’t! I’M YOUR OPPONENT!” and Yvain hits him so hard, Kay does a spinning backflip in the air before landing on the ground moaning. Then Yvain takes off his helmet and goes “Yo. It’s me.”

Arthurian myths retold pg 126-127