A man who was sleeping in a Queens subway car stabbed two thieves who tried to take his bags early Sunday, killing one of them, sources familiar with the incident said. The bloody scene unfolded across two train cars on a Manhattan-bound No. 7 train at about 12:30 a.m. The alleged stabber, a 69-year-old man, was dozing on the train, surrounded by his bags, when a group of five men approached ...