Noticing Oliver, Darryl did greet him warmly. "What are you doing here?"
"What did you tell my father after he woke up?" Oliver said.
Given his bad temper, the Black Tortoise King would never agree to meet Archfiend Antigonus. However, after speaking to Darryl, he met Archfiend Antigonus which was out of character.
Oliver never intended to question Darryl, but when he attacked the Black Tortoise King, he used it to threaten the Black Tortoise race to surrender to the fiend race. That made Oliver feel unsettled and his worry worsened as the Black Tortoise King acted out of character. Therefore, he went to Darryl to clarify the situation.
'What a fool.' Darryl chuckled and said, "I only advised the Black Tortoise King to surrender to Archfiend Antigonus. What else can I say?"
'Oliver has become a puppet of the fiend race. My plan with the Black Tortoise King is a secret, so why would I tell him?' Darryl thought.
Oliver did not believe Darryl and scoffed. "Do you think I'm stupid? I