It's rude not to answer someone's message.
Ken is a professor, and one of his students emailed him since they missed the last class.
Ken has to decide whether to respond to the student.
Ken feels bad, so he decides to give the student the PowerPoint slides he used for class.
Ken decides that the student should've shown up to class if they wanted help.
The students feels grateful and gets to prepare herself for any future exams.
The student feels like she did something wrong and still needs help.