Shang knew that he couldn't possibly beat Susan, but that also wasn't his goal.
Susan was the biggest issue for Jerald, and as long as Shang managed to distract Susan for a while, Jerald would be the one fighting her.
Even though Shang was using Distortion to approach her, he could feel that Susan knew exactly where he was, which didn't surprise him.
Susan was a Peak High Mage, and she even had a Darkness Affinity. Darkness Affinities dealt with a lot of subterfuge and illusions, making them similar to Light Affinities.
For a moment, the two of them only looked at each other.
Then, Susan's shoulder moved just a tiny bit.
When fighting another person physically, looking at the shoulders was the best way to see when an attack was coming.
As soon as Shang saw the slight movement, he immediately summoned all his Mana and life energy.