boston, a city of rivers and bays. a city of ethnic neighborhoods. a city rich in american history. and on april 15th, in the midst of mayhem, a city of selfless compassion. >> we actually had a pool of blood in the middle of our store. there was a woman actually grabbing spools of yarn in our store wrapping people to cut off the circulation so they wouldn't bleed out. >> oh, my good. >> people's whose um pulls was