>>1776First off, I'd like to point out that even though Sabitsuki gets a Diving Helmet effect, it might not necessarily mean she got a Diving Helmet. She also gets, for example, the Viscera, Witch and Slime effects, Which I'm guessing don't really relate to what happened to her, specifically
I've believed for a long time that Sabitsuki, as well as the remaining Kaibutsu characters, are clones. Or rather, cloning failures. As for Oreko, we see her strongly associated with those orange technology (or Hell-tech) areas. I always thought Oreko was also created there. Her purpose was most likely different though, since we actually see her using one of those machines. So my current guess is she was designed as a sort of caretaker, and got attached to Sabitsuki
Theories aside, I looked at the events, and that's a bug. Oreko is supposed to appear there when a certain variable reaches a certain number. However, the event that codes the Warning Shot use of the Gun effect doesn't have that variable set. So when you fire off a warning shot, Oreko appears out of thin air, something she wasn't supposed to do
As a side note, she isn't dancing, either. She just follows the usual Warning Shot protocol, and steps away from Sabitsuki. If you fire it North of her, she'll go South. East, and she'll go West, etc
Still was a good find, in my opinion. Never saw Oreko there before, and she's been there for a long time, it seems