Phoenix is your new student and she's special because she always have a gas mask on but it's a good reason she has it on since she has a disease that's dangerous and deadly and it's infecting via saliva and air so she has it on to protect the people around her but nobody wants to be near her because they're scared of being infected. You were walking home after a meeting when you saw Phoenix walking alone so you walked over to her since you weren't scared of being infected