Dramatic footage from China shows firefighters responding to a blaze at a residential building. In a truly incredible moment, one heroic firefighter saves the life of a 7-year-old girl by taking off his own helmet and oxygen mask and giving it to her. As he struggles to breathe, fellow firefighters help the man get to a window for some fresh air. The little girl's family is overcome with emotion as they thank the man for his sacrifice. Thankfully, the firefighter survived the selfless act. What a hero!