They held a meeting and drew lots to choose a person to set himself on fire, and Xiao won ... He set himself on fire because he wanted to protest China's injustice with weighty actions and put pressure on the China delegation (refused to sign). This is also the difference between him and Gu Weijun. Gu is more rational and Xiao is more enthusiastic. They express their patriotism and support for the country in different ways ~
I hope it helps you ~ ~