As the HK protests and riots go on, young people have adopted an aggressively intolerant attitude towards anyone who holds a differing view. Apparently this teacher had written an article criticising the violence by protesters, and he was beseiged by yelling students for 5 hours before he was finally let go.
What was equally outrageous was that, even though the teacher had called the police for help, the police were blocked by the Poly U Community College from entering the campus, for fear of student anger