What are the watchman and wulfgar roles at the court of Hrothgar? why are these important?

Dally chooses to die because deep down inside, he cannot live without Johnny and the pain of his death and not having Johnny around anymore is just too much to bear. He also feels in some way, a little guilty. In a way, his act was a bit cowardly. His friends have to live with the death of Johnny, just like he would if he didn't die. Now his friends have to live with the death of Dally too.