Arthur's eyes widened. "Lancelot?" he repeated. Gaius and his mother he could understand. But it stung a bit, that Merlin trusted Lancelot over him. He tried to think why Merlin would trust him - until recently they hadn't ever spent a lot of time together.
"Ah," he said. "The gryphon? Or was it whatever it was you did to stop the army of the dead?"