When doctors and nurses arrived at Room 834 just after 11 a.m., a college student admitted to the hospital hours earlier lay motionless on the floor, breathing shallowly, a sheet draped over his body. A Houston police officer with a cut on his head was being helped onto a stretcher, while another hovered over the student. Blood smeared the floor and walls. "What happened?" asked Dr. Daniel Arango, a surgical resident at the hospital, St. Joseph Medical Center. The student, 26-year-old Alan Pean, had come to the hospital for treatment of possible bipolar disorder, accidentally striking several cars while pulling into the parking lot.