Final answer:
Cyrano de Bergerac risks his life to send letters to Roxane in Act IV, expressing his love under the disguise of Christian's name.
Step-by-step explanation:
In Act IV of Cyrano de Bergerac, Cyrano risks his life every morning to send letters to Roxane. These letters are sent under the guise of Christian's name, which Cyrano uses to express his own feelings for Roxane, as he believes she could never love him due to his large nose. Cyrano's love for Roxane compels him to continue this dangerous act, showcasing his romanticism and bravery.