The assassin emerging from the shadows was naturally Lancelot. Seeing that Sonam was in critical condition, he launched a Shadow Jump from the utmost distance. The low-hanging red sun and the perilous terrain around him provided an ideal environment for his abilities.
For some reason, after returning from the Fallen Shadow Netherworld, all his shadow-related abilities had been enhanced. During the short period after a Shadow Jump, none of his actions would make any sound, and the target's attention was fully drawn by the condition of the Serpent Demon, which allowed him to deliver such a perfect lethal strike.