Roxxon had a simple assignment for him: Kill Iron Man. They'd turned him into a cyborg for this purpose and the already unstable Sebastian went completely homicidal killing everyone he saw with energy beams from his hands and slicing most to pieces with long sharp claws. The head surgeon was a splattered puddle of scorched red paste that might only be identified by DNA testing. Roxxon wanted a perfect killing machine and that's exactly what they got. Defensive turrets and traps were shredded and sat strewn everywhere with the dead and the dying.
He set the facility ablaze in his murderous rage, leaving every body to burn as he saw his target and ran through the flames at high speed, slashing at Iron Man's face and arc reactor leaving four deep claw marks in the metal of both and damaging the external unibeam lens effectively making it too dangerous to use. He continued to slash wildly staying at close range like a lunatic, aiming for sensitive joints like wrists, knees and the neck with the precision of a surgeon and the tenacity of a psychopath. Whoever he was, he was violently insane.
"I like killing, it makes me happy. Now I'm going to kill you."