Bobo's so-called knight was Etrigan's human form, Sir Jason Blood. He had once been one of King Arthur's knights and had all sorts of connections to Merlin.
During the age of Camelot, Jason had fallen in love with the famous Dark Sorcerer Morgan le Fay and become one of her devoted lapdogs. Morgan's most renowned magic was the Enchantment Spell, and she had once even made Martian Manhunter love her to the point of madness.
That period of mental control left an indelible psychological scar on J'onn. Even after being rescued, he had withdrawn from the Justice League for a long time.
J'onn and Morgan's story was beside the point and had nothing to do with the current matter. In short, Jason had liked Morgan, while Morgan had coveted King Arthur's body and kingdom. It was that simple.
King Arthur's will had been firm. He resisted the enchantment magic and even rejected Morgan when she offered herself to him. That made the Enchantress turn love into hatred, her feelings gradually twisting until she became King Arthur's arch-nemesis.
She began using Jason, her lapdog, to steal King Arthur's intelligence, and Jason told the Enchantress everything he knew without holding anything back.
But he was not a Traitor. He was a loyal knight. While deeply loving Morgan, he also deeply loved his king, Arthur. He hoped the two people he loved could be together. When they rolled around in bed, he would surely have stood guard outside the door with a smile on his face.
With his help, Morgan successfully drugged King Arthur and finally got what she wanted. But then she felt that having a lapdog standing guard outside while she slept with Arthur was rather unpleasant to look at.
So she decided to get rid of Jason. During one of