Though Belphegor had many opponents ganged up on him, he was attentive to his surroundings. He was aware when Red Death vanished from his detection. He paid more attention to the mana within his ice aura. His sense swept the surroundings. There was no trace of her presence.
'Did she use a teleporting skill to move away?' He thought.
When he was still pondering about the situation, he sensed a sudden burst of energy behind him. It only lasted an instant. Following that burst was the stinging pain of getting stabbed. He received critical damage from that stab. That burst of energy was gone as soon as it appeared. When he turned around, there was nothing.