Jenny said, “Dr. Houk, in regards to this T-139, you mentioned that the ambulatory stage lasts four to six hours. Then what?” “Well,” Houk said, “the second stage is the terminal stage, too. It lasts anywhere from six to twelve hours. It begins with the deterioration of the efferent nerves and escalates to paralysis of the cardiac, vasomotor, and respiratory reflex centers in the brain.”