The Texas doctor had six hours. Now that a vial of Covid-19 vaccine had been opened on this late December night, he had to find 10 eligible people for its remaining doses before the precious medicine expired. In six hours. He scrambled to find people available, and gave it to people with medical conditions, including his wife. Then he got fired for theft. What followed was “the lowest moment in my life,” Dr. Hasan Gokal said.