Derek listened quietly, made several sounds, and continued listening for any response.
After he had gone through all seven hallways, he decided it would be the middle one—because the others didn't echo or sound the same way back.
It was really a mental thing, and this was his only method to find out if he was right or not. Derek hadn't spent this long in utter blindness before.
After a while of contemplation, he stepped into the hallway and waited to hear any information—but he heard none.
Which should mean he was on the right path. Derek began moving inside the hall, clapping his hands and breathing deeply to detect any transition into a new zone.
He also took note of how the air felt—he couldn't afford to make any mistakes on this one. Derek felt a headache coming; he knew he had just one more minute until the lights would be turned back on.
