For knowledge is no knowledge until it be tried by life." So he went before the King and said, "If thou art willing, Cormac, I would gladly have one of thy sons in fosterage." At this Cormac was well pleased, and a young child of the sons of Cormac was given to Flahari to bring up, and Flahari took the child to his own Dun, and there began to nurture and to train him as it was fitting.
After a time, however, Flahari one day took the child by the hand and went with him into the deep recesses of the forest where dwelt one of the swine-herds who minded the swine of Flahari.

To him Flahari handed over the child and bade him guard him as the apple of his eye, and to be ready deliver him up again when he was required.

The Flahari went home, and for some days went about like a man weighed down by gloomy and bitter thoughts.

His wife marked that, and sought to know the reason, but Flahari put her off.

At last when she continually pressed him to reveal the cause of his trouble, he said "If them must needs learn what ails me, and if thou canst keep a secret full of danger to me and thee, know that I am gloomy and distraught because I have killed the son of Cormac." At this the woman cried out, "Murderer parricide, hast thou spilled the King's blood, and shall Cormac not know it, and do justice on thee ?" And she sent word to Cormac that he should come and seize her husband for that crime.
But before the officers came, Flahari took a young man, the son of his butler, and placed him in charge of his lands to manage them, while Flahari was away for his trial at Tara.