Final answer:
Arthur's subjects react with fear and astonishment after Gawain strikes the Green Knight, with the knights crossing themselves in a mix of fear and prayer.
Step-by-step explanation:
After Gawain strikes the Green Knight, there is a palpable sense of fear and astonishment among Arthur's subjects. The knights, including the illustrious Sir Lancelot, are described as crossing themselves, a gesture indicating both fear and a plea for protection. This reaction showcases the gravity of Gawain's challenge and the supernatural elements at play, hinting at the wonder and danger inherent in Arthurian legends. The passage from which the question is derived suggests a reverence for chivalry and heroism, as the knights exhibit outward signs of worry while internally musing on the implications.