If you meet a lazy teacher, then surely he has a student similar to him.
Students can influence his teacher in various ways, he can catch their laziness if he does not have good teaching principles.
I give an example for this problem: a teacher who is very diligent and eager to give good tasks to children and give deadlines a week, after a week later he hopes he will get a satisfactory set of tasks, but what happens? lazy children do for various reasons. They have many reason to did not do their task by making many reasons. And this is happen not only once.
If this continues for a long time, so that, the spirit of the teacher is getting more and more receding. His passion also went out. And over time he will be exactly with his student.
The silent teacher will turn into a female lion if she is dealing with a student who has extraordinary delinquency.
Just a simple talk
Have a nice day bro.