Wherefore," said Brian, "I deem that he is no friend to us." "If so, we have no help for it," said they, "for the herd belongs to some man of the Danaans; and even if we set to and begin to kill the swine, the pig of druidism might be the very one to escape." "Have ye learned so little in your place of studies," said Brian, "that ye cannot distinguish a druidic beast from a natural beast ?" And with that he smote his two brothers with a magic wand, and changed them into two slender, fleet hounds, and they darted in among the herd.

Then all the herd scattered and fled, but the hounds separated the druidic pig and chased it towards a wood where Brian awaited it.
As it passed, Brian flung his spear, and it pierced the chest of the pig and brought it down.

The pig screamed, "Evil have you done to cast at me." Brian said, "That hath the sound of human speech!" "I am in truth a man," said the pig, "and I am Kian, son of Canta, and I pray you show me mercy." "That will we," said Iuchar and Iucharba, "and sorry are we for what has happened." "Nay," said Brian, "but I swear by the Wind and the Sun that if thou hadst seven lives I would take them all." "Grant me a favour then," said Kian.
"We shall grant it," said Brian.
"Let me," said Kian, "return into my own form that I may die in the shape of a man." "I had liefer kill a man than a pig," said Brian.

Then Kian became a man again and stood before them, the blood trickling from his breast.
"I have outwitted you now," cried he, "for if ye had killed a pig ye would have paid a pig's eric,[16] but now ye shall pay the eric of a man.

Never was greater eric in the land of Erinn than that which ye shall pay; and I swear that the very weapons with which ye slay me shall tell the tale to the avenger of blood." [16] Blood-fine.
"Then you shall be slain with no weapons at all," said Brian; and they picked up the stones on the Plain of Murthemny and rained them upon him till he was all one wound, and he died.