Final answer:
The Green Knight challenges the crowd after their reaction to his game by proposing a beheading game.
Step-by-step explanation:
After the crowd quietly reacts to the green knight's game, he challenges them by proposing a game of his own. The Green Knight challenges any knight in the court to strike him with an axe, under the condition that the Green Knight can return the blow in exactly one year and one day. Sir Gawain accepts the challenge and beheads the Green Knight, only to witness the Knight pick up his own head and remind Gawain of the return blow.