attack by innuendo
If the teacher's criticism is changed in a different way, it may give them some fresh stimulation and let them receive unexpected results.
exceed one's expectation
When he does something wrong, if the teacher just scolds blindly, the effect can only be counterproductive, just like a mother yelling hysterically at a crying child, which will only make the child cry louder and louder.
Be entrusted with a "heavy responsibility"
It is easy to get twice the result with half the effort by entrusting the "heavy responsibility" to naughty children at the right time.