Cairn no. 2 is located at Brákarsund Strait and written on it in Icelandic is "Hér drekkti Skalla-Grímur Brák" meaning that Skalla-Grímur drowned Brák at this location.
Skalla-Grímur Kveldúlfsson had a bond-maid named Þorgerður Brák. She had been the nanny and foster mother to Egill, the son of Skalla-Grímur, and is described as big and strong as a man and skilled in magical arts.
One day in the wintertime when Egill was 12 years old Skalla-Grímur was playing a ball game at Borg with Egill and his friend, Þórður Granason. At first, the boys were winning, but later on, in the evening Skalla-Grímur got really strong and grabbed Þórður and tossed him onto the ground with such force that Þórður died.
He then went after his own son, Egill. Þorgerður Brák was watching the game and said: "Hamask you now, Skalla-Grímr, at your son". It roughly translated means if Skalla-Grímur is now going to attack his own son.
Skalla-Grímur got so angry that he let loose Egill and tried to grab Þorgerður Brák, but she ran. Skalla-Grímur chased her down to the sea where she jumped from a cliff into the sea and tried to reach the island outside of Borgarnes, now called Brákarey island.
Skalla-Grímur threw a big rock at her with such great force that Þorgerður Brák didn't resurface. Since that time the strait where she drowned is called Brákarsund - Brákar strait.
Source: Local signage