Final answer:
In 'Cyrano de Bergerac', the cadets warn Christian not to mention Cyrano's large nose, which is a sensitive subject for Cyrano, and the cadets want to protect his feelings.
Step-by-step explanation:
In the play Cyrano de Bergerac by Edmond Rostand, the cadets give Christian a warning about a certain topic he must never mention. The forbidden subject is Cyrano's large nose.
This is a sensitive topic because Cyrano is very self-conscious about his appearance, and the cadets know that any mention of Cyrano's nose could deeply hurt him or provoke his ire.
The cadets respect and admire Cyrano despite his physical peculiarities, and they protect his feelings by making sure that Christian is aware of this particular sensitivity.
Christian, who relies on Cyrano to woo Roxane through eloquently written letters, must heed this warning to maintain the camaraderie among the cadets and Cyrano's assistance.