A mountaineering ice axe has a narrow end, called the pick, and a flat wide end called the adze. The adze of the axe wounded Trotsky, fracturing his parietal bone and penetrating into his brain. The blow to his head was bungled and failed to kill Trotsky instantly. Witnesses stated that Trotsky spat on Mercader and began struggling fiercely with him, which resulted in Mercader's hand being broken. Hearing the commotion, Trotsky's bodyguards burst into the room and nearly beat Mercader to death, but Trotsky stopped them, laboriously stating that the assassin should be made to answer questions. Trotsky was then taken to a hospital and operated on, surviving for more than a day, but dying, at the age of 60, on 21 August 1940 from exsanguination and shock. Mercader later testified at his trial: