NEW YORK — For six minutes, Jordan Neely was pinned to a subway floor in a chokehold that ended with him lying still. But that's not what killed him, a forensic pathologist testified Thursday in defense of the military-trained commuter charged with killing Neely . Dr. Satish Chundru disputed a New York City medical examiner's determination that Daniel Penny’s chokehold killed Neely, who was behaving erratically on a subway the two men were riding. Penny's defense says that he acted to protect