"Get ready for a wave of demons below" the priest warns the two travelers. "I had a feeling that we can uncover the truth whether the demons can breed themselves or just mutates from their food".
Now that he mentions it, Min Soo and Crow never question from where the demons can multiply their numbers. If they know how to stop their breeding, then there's a chance to annihilate the demons from the core. Joey states his suspicion on the demons' breeding methods, there doesn't seem to be gender differentiation among the demons.
Thus, the terms male and females are invalid for the demons. They delved into the bottom of the mines, still wary of the demons around them. However, Joey starts to realize the flashlight he carries attracts the demons' eyes more since they're focused solely on their vision. Joey turns off his flashlight, leaving the team blind.
'"They're surrounding us" Crow warns them. "I don't think that flashlight will do any good the more we get down".
