At the last Sir Gawaine smote the knight so hard that he fell to the earth, and then he cried mercy, and yielded him, and besought him as he was a knight and gentleman, to save his life. Thou shalt die, said Sir Gawaine, for slaying of my hounds. I will make amends, said the knight, unto my power. Sir Gawaine would no mercy have, but unlaced his helm to have stricken off his head. Right so came his lady out of a chamber and fell over him, and so he smote off her head by misadventure. Alas, said Gaheris, that is foully and shamefully done, that shame shall never from you; also ye should give mercy unto them that ask mercy, for a knight without mercy is without worship. Sir Gawaine was so stonied of the death of this fair lady that he wist not what he did, and said unto the knight, Arise, I will give thee mercy. Nay, nay, said the knight, I take no force of mercy now, for thou hast slain my love and my lady that I loved best of all earthly things. Me sore repenteth it, said Sir Gawaine, for I thought to strike unto thee; but now thou shalt go unto King Arthur and tell him of thine adventures, and how thou art overcome by the knight that went in the quest of the white hart.