Amon waited until the door mechanism completed its sequence. Once the door slid all the way into the wall, the rumbling stopped. Silence returned. Amon stayed still as he focused his hearing from the now-revealed opening. No sound. It was complete darkness beyond the open door.
He picked up one of the debris on the ground and threw it into the opening. He heard the debris hitting the floor and bouncing a few times.
No traps.
He then approached the door. He remained fully alert at all times. He extended one of his hands through the opening. When nothing happened, he took his first step inside. He paused. He had taken all the precautions. It was time to take a leap of faith. He entered the room.