Gawain's Temper Gets in the Way
Sir Gawain is known for being hot-headed and acting impulsively. Normally, this just provides an opportunity for jokes by the other knights and the public. Gawain was the first knight to decide to go on the Quest. But this time his temper has interefered with his ability to successfully complete the Quest.
It has been reported that Sir Gawain and two other knights have been killing many other knights during the Quest for some offense or another. There was report of a situation where Sir Gawain killed his cousin Yvain, King Bagdemagus, and sixteen other knights. An unnamed source said that an old hermit had told him he would not complete the Quest because he lacked the ncessary humility and temperance to be holy enough to achieve the Grail.
Recently, Sir Gawain returned to Camelot and admitted that, while he found the castle containing the Grail, he was denied entrance because he committed to many immoral acts.