Question

خونسردی معلم در کلاس نظم کلاس رو بهم میزنه

Answer 1

(The) teacher's coolness/calmness in (the) class disrupts its order.

Comments

I have my doubts about this statement, I must say! How a teacher's being composed and in control disrupts the peace and order in the classroom?  

So, I'm wondering if what is being critically assessed here is not so much composure but more an 'indifferent' or a 'cold' attitude?

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You might then mention this to the dear questioner since I have merely translated the term and "خونسرد" means someone who is calm and patient enough that does not get angry very soon.