The supreme elder noticed his actions and stopped smiling. She said, "How disrespectful. It seems you want to be forced before you can see the light."
She signaled to the people beside her to pursue Arthur. Then she called out to the other two, "You fools. Catch him now, and I won't punish you for making me come out here to do your job for you."
According to their plan, she didn't need to come out at all. In fact, it was better that she didn't join the pursuit and that no one from the family be directly linked to the pursuit.
But the three fools that she sent to capture Arthur did a bad job of it. From the way things looked, Arthur was going to escape. She couldn't allow that to happen.
She had three choices to make. Either send more capable people to go ahead of Arthur and waylay him, give up on Arthur and hope it doesn't bring any trouble to her family, or join the pursuit and get the job done herself.
She chose the third option. This is why she appeared in front of Arthur.
