At 6:48:20 p.m., Sergeant Joseph Memoly, just arriving on the scene, put in a second call for the Emergency Service Unit. Busch was either forced outside, or broke free from the officers. According to police, he then ran up a narrow stairway from the apartment, struck Sergeant Terrence O'Brien with the hammer several times on his left arm, then rushed past other officers. He stood on the sidewalk, wearing a tallit and tefillin, with the hammer raised over his head. Six officers who responded to the radio calls stood on their feet, guns drawn, in a rough semicircle around him. They shouted at him, one officer "almost pleading" to drop the hammer. There was a distinct single shot, followed closely by a volley of 12 shots, which were fired by Seargent Memoly and Officers Martin Sanabria and William Loshiavo, whereupon Busch fell dead. Alternatively, Busch took a step forward, was screaming while swinging the hammer, and kept coming at the officers. He was striking a fallen police sergeant with the hammer when he was shot.