Answer:
Explanation below
Step-by-step explanation:
What I think is that the teacher was doing it without all seriousness. Because, if it took it serious he/she would have melted out the same position with the same duration to the students.
I think the teacher should have warned them and told them to punish them if the action is repeated.
No. They will be silent for the period of the punishment and resume to the immediately they are released.