Ye Xiajie is in unbelievably dire straits. It was far worse than simply digging his heart with a knife. He lost control of his aura, causing the Abyss' overwhelming darkness to explode. Vearth began to show cracks, and the cracks let forth a black fog. Even from inside those fissures, anyone in the Nether System can hear the deranged creature growling.
His feelings are intertwined with those of all the entities in the Void since he is the Abyss's lord. These creatures would be entirely under his control provided he maintained his composure and lack of emotion, but if he became overcome by rage or despair, the monsters would all become mad due to the turmoil in their ruler's heart.
Obviously, like his heart, the whole Abyss is out of control, but sadly the only person who can bring him out of this misery is no longer around.
Rumbles~ the land and heavens are shaking.