What Would You Do?

Senario 3:
 An intern arrives at their site school. Their teacher is absent, and there is a substitute. Usually the intern is in charge of monitoring the reading groups each day. Even though their mentor teacher is gone, they know that they should keep monitoring the students so that they can progress further in their reading. The substitute tells them that they have everything under control and that the intern can leave because there is nothing for them to do.
The intern decides that their mentor teacher will get their students caught up the following day. The intern decides to go to the classroom next door where their friend is interning. The two of the interns move to the corner of the room and begin to work on homework for the rest of the period so that they wont disturb any other students.
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Well! If I were the intern for this classroom and my mentor teacher is absent without notice, I would be a little curious. Even if the substitute were to tell me that I am able to leave since they "have everything under control," I would be responsible and stay with the students, and make sure that the students are doing what they need to be, since I would be a little more used to the students compared to the substitute teacher.
I wouldn't want to be the irresponsible type of intern that would go disturb another interns classroom, to go be with them, and do homework, instead of doing what I am expected to be doing.