Julia would not betray him. Even if she raised her sword against him, Arthur would choose to believe she had her reasons. It was not a blind trust with no foundation because he had seen the worst of her.
Their friendship started in Runera, and time after time, she proved to be a better person than she believed. She changed, and he saw it in her. She no longer cared about becoming the youngest grandmaster after she met him.
"It has to be either her father being held captive or the one threatening her, but he does not seem to be someone who does the latter," said Arthur with a worried expression. "Julia is in danger."
Arthur could not do a thing before he reached Runera with his army. Another option was to leave his army behind and fly toward Runera, but it might be a trap designed to lure him away from his army.