The failure of the Trio was not worth mentioning; the cunning Snake King was no easy foe to deal with.
The success of their first kill had given them some inertia, subconsciously leading them to believe that the "Snake King" was nothing special.
The Snake King, having already died twice, was thought to be manageable, provided they were cautious. With the Giant Toad as a temporary ally, killing her a third time seemed not too difficult.
However, once the cunning Snake King recognized the human threat, she endured the brunt of the Giant Toad's assault and recklessly charged the Trio, playing a game of mutual destruction.
Her flesh turned into a deadly poison pool, and the Trio, who were too close, were completely engulfed by a Rule-level self-destructive toxin... Even they, who had seen many battlefields, had never faced such a scene. An opponent of this tier would actually self-destruct, having also held the ace of "Life as Toxin."