Caster caught him as he fell- it wouldn't do her any good if he hit his head on the way down.

...He had no idea, did he? And even as he was about to pass out, he'd offered to protect her.

Perhaps, in a better state of mind, she would have been touched by the thought. But instead, she dispelled the magic keeping him in place, and set about binding him up to prepare for her broadcast. All the pieces were slowly falling into place.

She would have her vengeance, no matter what she had to do.