I usually check for students who join the attendance check and then leave the classroom by thinking that the teacher would not notice. I actually caught and penalized a few students in the past. However, it looks like I missed one student last week. That student will be penalized. Also if you disappear from the class after the attendance because of a technical problem, you must send an explanation to the teacher a) why the technical problem happened b) what you did to solve the technical problem c) why did the technical problem lasted for 85 minutes until the end of the class d) what you will do to make sure the same problem does not happen again. Thank you!