it rotated and began to glow brightly unleashing a single beam of golden light swirling and vibrating in a rapid pulsar succession towards the back of the cave and within seconds the entire mountain started to shake , rocks fell from the sky , trembling noises rumbled above , and the mountaintop exploded in a brilliant blast as the gilded light permeated the air above them in a sudden flash making the entire crew cover their masks faces at the intense brightness .