Who first attempts to accept the green knight's challenge?

According to SparkNotes, Sir Gawair steps in front of Arthur to challenge the Green Knight

I’m not i use this app but it only with homework and stuff like that

This was already the answer "the use of academic language creates an angry and disdainful tone. the use of academic language gives the text a serious and instructive tone. the use of words with strong connotative meanings creates a sorrowful tone."