Unknown relationship

Third person pov:

They stared at each other intensely. It looked like Camael was coming up with a plan while the purple half-demon continued to look at him, anticipating his attack.

Camael made the first move; he did not attack. Instead, he walked around the purple beast, still keeping his guard up.

As it usually did, the purple demon looked at him strangely. The demon felt the urge to attack Camael, yet it knew something.

Camael moved around; he was not within the demon's reach, so he casually walked in a circle.

He raised his karambit to his face and proceeded to cut his own cheek in a straight line. The blood on his face dripped to the ground.

"Holy field!" The ground lit up and glowed brightly; even the demon was temporarily blinded, but it recovered quickly.

Camael took a bit of blood from his cheek and smeared it on his karambit blade. He also marked his chest with the depiction of the sword of light.