Chuxue was freaked out and thought that Zong Shou was going to put her out of her misery so that she didn't suffer.
A short moment later, he realized that the sword had avoided the heart. The angle at which it stabbed in from was also tilted.
When Zong Shou pulled out that lightning tooth sword the sword tip was dripping thick blood.
...it had also become purple-black in color, but one could roughly see the purple gold lines within.
Zong Shou brought the sword tip to his nose and took a sniff, immediately frowning. A lightning glow exploded out at the sword tip and it burst the thick purple-red drop of blood into pieces.
This poison could corrode weapons. Luckily his sword could activate a lightning glow barrier which suppressed it.
However, when the blood was smashed into pieces it gave off an even worse stench. Chuxue nearly fainted and fell to the ground.