your role switched with Tengen's wives

Even when he was held back by Gyutaro's poison, Tengen was able to properly determine the most efficient strategy to fight off the Upper Rank demons and even fooled Gyutaro into thinking he was dead by stopping his own heart to prevent himself from dying from his poison, which managed to give Tengen an edge against him,

but still, Tengen almost died from Gyutaro's poison, but Nezuko helped him recover by her blood demon art. She burns the poisoned wounds, making the poison fade away