A puzzling story of IIT Delhi

This is a story one of my friends at Bansal classes tells most of his students (taken from another site). Interesting.

. A Puzzling Story of IIT Delhi .

"One day, when I was a third year student, one of my friends woke up very late (as usual in IITs). He got ready quickly without having his breakfast and rushed to his department from his hostel premises. When he entered the building and pushed the lift button he knew by that time the classes must have been started. Then suddenly what happened! The professor who was to deliver lecture in his class also came there for lift. That time the lift used to have a maximum capacity of five people and the lift already had four. So the student, to show respect for him allowed the professor for the lift. And he had to run up the stairs to his class which was on fourth or third floor (I forgot which one). When he reached his class…but alas! The professor had completed the attendance.



THE BIG QUESTION: Now what should have the professor done? Should he have ticked his name considering his good behavior? Or should he have not ticked his name considering he was late?"