Robert Jones works on the evening shift in the ED at a large urban hospital that frequently receives victims of gunshot wounds, stabbings, and other gang-related incidents. Many are high on alcohol or drugs. Robert has just interviewed a 21-year-old male patient awaiting treatment for injuries resulting from a fight after an evening of heavy drinking. Because his injuries were determined not to be life-threatening, he had to wait to see a physician. "I'm tired of waiting. Let's get this show on the road!" he screamed as Robert walked by. "I'm sorry you must wait, Mr. P., but the doctor is busy with another patient and will get to you as soon as possible." He handed him a cup of juice he had been bringing to another patient. The patient grabbed the cup, threw it in Robert's face, and then grabbed his arm. Slamming him against the wall, the patient jumped off the stretcher and yelled obscenities at him. He continued to scream until a security guard intervened.