Shock was plastered across Yulthar's face.
He had constantly kept up with Rex's mind—allowing him to predict the move, Rex was going to make before it even happened. Reading a mortal's mind was one of his forte, it was one of the abilities he retained despite within the body of an avatar.
A flawless ability, and coupled with his celestial sense, nothing should be overlooked.
But the attack Rex did earlier was unpredictable, and he got hit by it.
Yulthar staggered to the side in utter shock—he reached his hand towards his face, feeling a burn on it which made his body stiffen. Sharply, he turned to look at Rex and was greeted by a haunting smirk.
In a pompous manner, Rex tapped his chin, "What was it again...? Oh!"