Chi Xue and the others were still useful. At the very least, they were backup candidates. The Lord of the Universe wouldn't watch them get killed by Ling Tian. He would go to great lengths to "protect" them, and in doing so, he would naturally protect Venerable Sword Saint as well. Besides, Venerable Sword Saint wasn't completely useless to the Lord of the Universe. At the very least, he could still pose some threat to Ling Tian and the others, or, failing that, protect Chi Xue and his companions. With all that in mind, killing Venerable Sword Saint wouldn't be easy.
The thought made Shi Tian anxious. After all, killing Venerable Sword Saint was something he had dreamed of for a long time.
"Even if the Lord of the Universe protects Venerable Sword Saint while deliberately protecting Chi Xue and the others, Venerable Sword Saint's usefulness has already diminished. So we still have some chance of killing him." Ling Tian spoke in a low voice. Seeing Shi Tian's expression ease slightly, he continued, "Besides, you and I both know that Venerable Sword Saint's Bloodline Power has already begun to decline, and it'll only get worse with time. He won't keep dragging this out. If nothing unexpected happens, he'll try to break free of the Lord of the Universe's restraints before long. Then we'll have a chance to attack him. We can kill him while he's adjusting himself to peak condition."
"Of course, that assumes we can reach him before he starts trying to break free of the Lord of the Universe's restraints. Otherwise, he'll probably be struck dead by the lightning tribulation," Ling Tian added.
At this, Shi Tian fell silent. He had realized the same thing. After pondering for a moment, he said, "There are plenty of Teleportation Formations