Unarmored Space Marine durability

Ramiel caught the attack, wrapping his right arm around Ecanus's left and using his other to hook the Fallen's neck, pulling him into a headbutt that began when Ramiel had leapt from the ground and ended when it dented Ecanus's brow and caved-in his right eye socket.
...
	Grunting with effort, the Chaplain hurled the Fallen Angel across one of the barbed sections of the arena floor. The carpet of microscopic blades ripped open Ecanus's skin as he tumbled over it, leaving him bleeding from hundreds of small lacerations.
...
Ecanus skipped forward and flipped over Ramiel's sword stroke. Landing behind the Chaplain, Ecanus scooped up the impaler with his foot; catching it as he lunged at the Chaplain. Ramiel had read Ecanus's move, his clumsy sword stroke a lure. Turning on the balls of his feet, he side-stepped the impaler's tip, grabbed its haft and pulled Ecanus onto its outstretched blade. Ramiel felt the Fallen's body judder and spasm as the blade punctured his primary heart.
...
	The Chaplain ignored Ecanus's desperate hands as they tried to push him away. Ripping the blade across Ecanus's chest, Ramiel scythed it through the secondary heart and tore it out through the shoulder. The Fallen's body fell to Ramiel's body in a ruined heap.

Reparation