Derrick was getting a little weirded out. The sound was somewhat familiar yet irregular in its regularity, sounding more alien the more he listened. It was rather strange, but it also made him curious. But, as they often said in his village, curiosity killed the butcher's cat. Poor Mr Johnson, he'd loved that cat so much.
There was quite a number of reasons not to explore the source of the noise. For one, it was behind an iron door, as good an indication as any that whatever inside might be dangerous. Secondly, they sort of had somewhere to be, and this was at best a distraction; there was only a small chance that this would benefit them in some way. A very small chance it was, but it was there at least.
Ultimately, though, Derrick was curious. He supposed that it was the strange allure of the forbidden, the feeling that even though you're not supposed to do it, you want to know what will happen if you do. He sort of really wanted to open the door, but it wasn't just his decision to make.
"...Should we open that door?" Derrick whispered after a pause.
@Dusksong@Hekazu