What is the teacher to his student, when he surpasses him in every way?

Ifriel was taught by Dr. Darkfire, who benefited from the boy's unique capabilities and handwork where he lacked almost any.
Both have a cold, scientific presence to their work, but where Silver is more professional Ifriel is more absorbed in the...mess of the work. He feels a satisfaction and revenge in the act of surgery. He's Cronenberg-ian.

The boy was a natural, but his temperament and rashness came with a cost. A deal was struck between the boy and a low-level celebrity, wherein he would replace the man's eyes with emeralds. The payment would be more than he could imagine. His master found out, and their deal was off; Silver would leave with clean hands, and Ifriel would sink into depravity deeper than ever imagined. The operation failed, and the boy left with a price on his head.

Ifriel lives in a world of deals, organs and transplants; robbing bodies, alive or dead, for their parts, selling them or mutilating them for a price.
Silver lives in a defensive bubble, where best he can protect himself from the unknown; everything else is a benefit on the side.