The Death Knight, who had just crossed paths with his natural enemy, had narrowly escaped annihilation. In the state he was in, it was hard to tell whether he had truly survived or not.
A hint of indignation began to rise within the mind of the undead orc. Losing the Death Knight at this point was truly a problem for him. This is why, at the very last moment, when the Death Knight was about to vanish, the orc used a clever trick to save him.
He had been brought back as an undead by the Death Knight, and many of his memories and knowledge had now been shared with the Death Knight, even though the latter was unaware of it. A bond had formed between them. As a creature tied to the Death Knight, the negative energy that connected their souls was potent.
If the Death Knight could unconsciously tap into shamanic powers, the original owner of these abilities—meaning the orc—could, to some extent, manipulate the Death Knight's power.