Prof runs after student, deregisters him

On 3Nov EE200 class in L2, Prof. Naren Naik literally runs after a student. The student leaves the class from back side door of lecture hall, Prof notices him and rushes towards the front door and leaves the class for a minute or so. The student and Prof likely had a talk after that. On 1st Nov Prof had already given his 'longest speech in his 16yrs teaching career', which he also hopes not to give in remaining 8 yrs of his teaching career, after he noticed another student leaving the class after marking the attendance in front of his eyes. He also said that day that the next time he notices anyone leaving, he'll deregister him/her from the course. Prof constantly points out one or two students in every class to focus on board rather than scrolling on mobile phones😂. I don't know the student but I haven't seen him in class after that day. Any leads, kindly let us know in comments.