when the door to the laboratory opened wide, and the threshold was crossed, he could immediately catch your eye.

....if you look closely.

the guy was sitting at his desk at his laptop, getting up on his knees, bent in the back. his expression radiated undisguised irritation and fatigue. Felix rested his chin on his arm, which was propped up with his elbow. noticing the presence of an outsider in his laboratory, he turned his head in their direction.

"...what do you want?"