Accept the hospitality, but kill them later.

On page 72-81 of Beowulf, the story of the Danes is told. The Fins and Danes fought and when the Fins came on the brink of being victorious, a truce was made. The Fins kindly board the Danes for the winter, because their leader was killed in the fight. When spring comes, the Danes rise up agansit the people who had given them their hospitality for the cold winter season, kill their leader, and carry off his wife.

The odd part of the story is that the Danes are the ones who are the heros. How could you look up to someone after they turned on the people who refrained from killing them and kept them safe for many months? Talk about a problem with your mortality!