It is only after he is rebuked for his dithering by a woman – whom he kills – that he rescues Forach, killing Cellach and blinding Cormac in the process. The story continues with the Déisi's expulsion from Tara, their sojourn in Leinster, and their patriation in Munster following the marriage arrangement between Ethne the Dread and Óengus mac Nad Froích. Here, however, aid in exploiting the prophecy that ultimately allows them to displace the men of Osraige comes not from a seer-judge, but from the "haughty daughter" of the Osraige druid who delivers the prognostication. Of the material not in the A version, by far the most substantial is in a lengthy tangential episode dealing with the birth and childhood of Óengus' foster son Corc Duibne, progenitor of the Corcu Duibne, whose name is merely mentioned in A. Corc and his brother are born of incest to Coirpre Múse and Duihind, children of the king of Munster Conaire Cóem, and their nativity brings famine to the land. The people want them immolated, but Corc is saved by a druid and his wife who take him to an offshore island so that his curse is removed from Ireland. The druid's wife, Boí, performs purification rituals that ultimately transfer Corc's curse to an otherworldy white cow, allowing him to return to his family. Eventually he serves as hostage in Cormac mac Airt's court, where he is fostered by Óengus; he accompanies his foster father when he is expelled from Tara. He tries to convince the wandering Déisi to settle on the island of his rearing, and stays there when the Déisi opt to move on to Cashel. The variant text MS 1336 (olim H. 3.17) occurs with the different title, "Cóecad Cormaic i Temraig" (Blinding of Cormac at Tara); and this text is also postscripted by a tract which alleges that the Crimall, the spear in the age of Cormac, was also the same weapon as the Lúin of Celtchar and the spear of Lugh. Section 11 of A describes Eochaid son of Artchorp traveling oversea with his descendants and settling in "Demed" (Demetia, later known as Dyfed in Wales).