VIDEO: Firefighters take down maniac hacking at wife with cleaver in Chinatown

Two heroic city firefighters pounced on a cleaver-wielding maniac yesterday as he hacked his terrified wife, authorities said. The bloody attack, outside Fong’s Trading at 74 Canal St. in Chinatown, was captured on chilling security video. Firefighters José Ortiz and James Trainor, who work across the street at Engine…