Cú Roí attacks him in kind and their stones meet in the air. They pause when on Cú Roí's request, Amairgen allows the cattle to go past Tailtiu, but seeing as the passage had become difficult, Cú Roí agrees to withdraw from the contest altogether. The episode in the Book of Leinster (Recension II), called "Imthúsa Chon Ruí meic Dáire" (header) or "Oislige Amargin" (text), offers by and large the same story, but adds more explicit detail, notably on the point of Cú Roí's sense of honour in his encounters with Cú Chulainn and Amairgin. First, Cú Roí explains his refusal to fight Cú Chulainn not only by pointing out the inequality between a physically healthy and an injured warrior, but also by saying that a victory would not be his, seeing as it was Fer Diad who had laid low his opponent. Second, the conclusion of Cú Roí's fight with Amairgin is told from a perspective which highlights the role of honour in his motives. Medb insisted "[b]y the truth of your [Cú Roí's] valour" ("[a]r fír do gascid fritt") that he should abandon the competition, obstructive as it proved to be to the progress of the expedition. Cú Roí, however, was determined to persist "till the day of doom" ("co brunni brátha") unless Amairgin agreed to stop. (When the matter was settled and Cú Roí returned to his country, Amairgin resumed his attacks on the invading army, explaining that his agreement was with Cú Roí only.) Cú Roí's death by Cú Chulainn's hand is the subject of the tale "Aided Con Roi", which survives in two versions. A number of tales describe enmity between the two warriors, and some allude to a lost story of its origin. Texts such as "Forfess Fer Fálgae" and "Siaburcharpát Con Culainn" describe a raid on Inis Fer Falga (possibly the Isle of Man) in which Cú Roí and Cú Chulainn come into conflict. The texts indicate that two were involved in an Ulster raid on the Fir Falgae, with Cú Roí participating again in disguise.