He cracks his neck.
Mark arrives alone.
For the first time, Mark isn't the pawn. He’s the player. Invincible - Season 3
He doesn't kill her. He restrains her. Using a technique he learned from Battle Beast—redirecting an enemy’s force against their own joints—he locks Anissa in an unbreakable hold, her own Viltrumite strength turned into a prison. He holds her for seventeen hours, hovering in low orbit, until Cecil’s scientists develop a sonic dampening collar. He cracks his neck