He was a serial killer of Madripoori nationality according to what was on him known only as Dirge. When Stark grabbed him he started laughing again then when he dropped him he dug his claws into the side of a box truck slowing the descent before charging at him again and dodging the Unibeam, Stark must have been getting desperate to use it when the focusing lens was damaged from his initial attack.
"I like the color of blood, your armor is close but I'd like to make it closer." He slashed into Stark's shoulder doing a handstand and slashing wildly at Stark using the full agility that he possessed to outmaneuver Iron Man and repeatedly cut into him latching onto Shellhead's back and attacking his thrusters with multiple cutting torches all the while gradually slicing his way through the armor with sadistic glee, humming a little tune as he continued to cut. He seemed to know exactly where to attack and was precise in his systematic targeting of vital parts like a surgeon.
"Let's see, quick death or slow death. I think I'll make sure that you can feel everything slice of the knife, I can play with you for about a month that way. Oh what fun that will be!" wrapping a clawed hand around his throat he laughed.
"Unlike most people I don't care who is behind that mask, what butcher cares if his steak had a name?" He implied that he didn't want to know who he was, making him just another statistic. He finally revealed another weapon shooting Tony in the back with a repulsor beam while still attached. Now all eight of them would be detected.