Since Jeremie had successfully freed William from XANA's clutches, XANA had had a personal vendetta against him. His once-powerful slave had retained the power he'd been given by the program and used it too many times to defeat him.

It was time he be defeated once and for all, the program decided.

Perhaps his clinginess to Yumi will be the way to get through to him. And if he's fortunate enough, he could take them both out then and there.

He activated his tower and possessed Hiroki.

It took Aelita a grand total of forty-two seconds to save the day.