Seated in front of shelves stuffed with leather-bound books and wearing a navy suit, a two-tone blue tie and a clip-on microphone, Albert Chen looks every inch a scholar. To his right, the initials of the University of Hong Kong (HKU) – where he is a professor and chair of constitutional law – stand proudly, and remain in shot for the entirety of the 13-minute-long video lecture, the first of 24 for HKU’s mandatory national security course. Without uttering a greeting and speaking in English, Chen begins in a monotone: “This lecture is mainly about the Chinese constitution, the Basic Law of th…