Ten o'clock
Now and then he raised his head , disturbed by the fluttering and screams of the night birds , attracted by the extraordinary brilliancy of the countless wax tapers . The time passed slowly in the darkness ; the silvery sound of the warriors ' hammers re-echoed through the vaulting . Luna got up and visited the markers to record his visit . Ten o'clock had struck when Gabriel heard the wicket of the Puerta de Santa Catalina open quickly but without violence , as though a key had been used . Luna remembered the bell-ringer 's offer , but soon he heard the sound of many steps magnified by the echo as if a whole host were advancing . `` Who goes there ? '' shouted Gabriel , rather alarmed .