Quote Originally Posted by Quizatzhaderac View Post
IRL, essentially every animal's eyes can track a moving object. And also point at a new target in a fraction of a second. If Sunny's main eye worked like that, Xykon and Redcloak would have basically no chance to cast during the main fight.
Sure, but Sunny's (and any beholder's) antimagic cone is not dependant on the direction or movement of the pupil. It radiates outward from the whole eyeball and only moves if the whole body rotates. That's also why ruleswise a beholder can only reorient its antimagic cone once per round.