Answer 1
-Pg 711, they were shocked at first when the knight came in
-Shows reader that they were not expecting it.
-"Astonished and still", they're definitely nervous and scared.
-Could possibly be tired of getting challenges.
Answer 2
-He's heard so many things about their wondrous deeds and thinks it's funny that they don't seem to step up when it comes to him
-Antagonizing
Answer 3
-His reaction is saying "he's had enough with the making fun of"
-Chivalry and honor is very important to him
-Green knight made a fool out of Arthur and he would not stand for that
-Stands up and takes challenge because he does not want the green knight putting down his men and his kingdom
Hope this helped! :)