One reason was that his own HP had largely recovered, the other was Zhou Tian noticed the Necromancer showing signs of retreat. Hence, in order to detain this Necromancer, Zhou Tian promptly launched a counterattack.
With a thought, Zhou Tian activated the ability of the Teleportation Ring and his silhouette immediately appeared next to the Necromancer. After that, Zhou Tian didn't waste any time. He directly raised his Tiger Head Saber and began slashing at the Necromancer.
Upon seeing Zhou Tian suddenly appearing in front of him, the Necromancer was genuinely startled. He knew he had no chance being Zhou Tian's opponent. He resorted to scheming Zhou Tian before, because of the fact that in close combat he was no match for Zhou Tian. Now, seeing Zhou Tian suddenly appeared in front of him, the Necromancer immediately started defending himself.