Voice coming from the microphone is the leader, professor is a government employee, students are the people, brave guy is the revolutionist, and killers are the repression tool. 2+2=5 will be the reality after students "ppl" were scared to stand behind the brave guy "revolutionist".Microphone represents the real leader to give commands and professor is the tool to announce it publicly so ppl won't say the leader is tyrant. a 7 mins video represented what we've learned in a century.