Final answer:
The question seems to be about characters named Christiane and Alex, but the provided references are about different characters and stories; therefore, an accurate answer cannot be given.
Step-by-step explanation:
The question pertains to a reaction Christiane has upon seeing Alex at a protest. However, the provided references do not mention a character named Christiane or an event involving her seeing someone named Alex at a protest. Instead, the references discuss Calixta and Alcée's interactions during a storm in the story The Storm by Kate Chopin. Additionally, another reference is made to a character named Grace planning to become an ambulance driver. Since the details provided do not align with the question, and without any further context or information about the story involving Christiane and Alex, it is not possible to provide an accurate and informed response to the original question.