Well, when you've finished all the tasks and you're at the 5th floor. At the party interact with them. They won't really fight, but they would threat each other and stuff.
It's quiet an interesting game.. It can represent some mental health issues as self harm maybe? As like "don't let it out" Might be something inside her that makes her struggle. As a negative sensation.. I'm not fully sure.. If you have a theory I'd love to hear it!