Just for science? The human says that like doing things for science is somehow innocent. Like science isn't used for all kinds of unsavory things, some of which he enjoys, but one of which was creating him.

"Then go mad," he growls softly. Since scientists certainly helped him along in that respect. "Or ask someone else."

He considers crushing the human, but it really does seem more effort than it's worth. Mostly he just wants to be far away from the creature at the moment. It brings up memories that he'd much rather not think of. So instead he simply turns to leave instead.