Please VI him!
Some things I spotted - He gesticulates when he speaks. Seems to have quite a lot of energy, although he looks quite casual in front of the class. He seems friendly and people (including me) think his lectures are interesting to listen to. He doesn't smile much, but he seems positive towards people. He said he always runs out of time before he covered all the material he has. He jumps between ideas a bit. The content of his lecture seemed more like a jumble of cool things to know, not one fluent line of all-you-need-to-know knowledge about the topic. His eyes are calm and relaxed, but eyebrows move sufficiently much.