Fritz's crimson eyes turned back into their original color after he blinked. It just made Knack more curious about him. He excels in physical and mental ability and holds a mysterious identity to everyone.
"Does that mean you can see through walls? Like an X-ray?"
"It is much more than that, but it does take a huge toll on me every time I
exert me."
So, Fritz seldom uses Alfred's Eyes to its full potential because of its drawbacks. It would give him severe headaches fatigue of his eyes, and it also slowly consumes his mana.
"Then I don't really have a chance of winning against you. I feel like everything's been foreseen before it even started."
When Fritz threw Knack on the ground, his back slamming with a thud, Knack even thought of standing up on his feet again, but then Fritz propped his forearm on Knack's neck.