If Xiao Yun did leave the grandpa here, the old man must wait for another person to come or until she finished the tea party. With how little people entering the maze, the first option and the second option will make the old man to wait for hours to exit the maze.
She couldn't do that. Being late to the tea party is one thing but leaving a person for the sake of attending the tea party was another thing.
"You are a very good child." The old man praised for Xiao Yun's kindness and Xiao Yun reply with her angelic smile to humbly thanked the old man's praise. "Thank you for your words."
By the time they did arrive at the entrance of the maze, Xiao Yun bent to ask the old man. "Where would you be going to, grandpa? I will help you there."