"Y'know... There've been a lot of unanswered questions, here. Maybe I can shine a light on things?" Chiketsu seemed to be very solemn as she stated this. Totally not like her usual self.
"Firstly. The bust. I think it's pretty obvious by now that Aiko was struck in the head by it. Why are both noses broken? Because they met face to face. When two faces meet, the noses tend to touch first. That being said... I think that puts to rest Himiku's little 'bust hammer' theory. It would have to hit her in the chest to even be viable as a hammer. In fact, I think Aiko was unconscious when she was dropped onto the poker. She was dropped onto it after being struck over the head and passing out." She crossed her arms over, frowning.
Suddenly, she turned to face someone. Her target seemed to be the one-armed strategist. She locked eyes with her, staring intensely. "Vermilion... About your testimony. The person you heard... Definitely had to be the killer. The killer was likely heading back to clean up their prototype, don't you think? But bad luck struck. You were there, and they couldn't afford any witnesses seeing them. So they... Ran away." Chiketsu mimed two legs running away with two of her fingers.
"In truth, I have my own little story to share, too. I told Hibiki about it, but not in specific detail." She nods. "I was in the library around 3:30. About twenty minutes later, I hear the sound of someone coming in. But when I looked, nobody was there. It's as if the person saw me and ran! Just like in Vermilion's story. Minutes later, we discover the fire and body. Odd, isn't it? Paired with what VV just said, it sounds to me like someone was running around, looking for a place to hide. After all, both of those rooms were in the recreation wing."
Her attention turns back to the group as a whole. "But I would like to bring up something else that may explain our unanswered questions. Have we not even considered our killer may have used magic? I think it's likely, and here's why: The prototype makes no sense. Why would you even need to set it up? Everyone here knows how gravity works, right? If you let go of the rope, of course the bag of flour will fall onto the X. What was being tested, here? That gravity still works? But if they were experimenting with their magic... Suddenly it makes a lot more sense to need to test your plans."
Chiketsu nods... pausing for only a few moments. She closes her eyes before she speaks again.
"One other thing. Those breadcrumbs by the ship... It was strange. Was somebody there, eating? It seemed irrelevant. But then... I thought about it a little harder. You know what's often on ships? What often loves to eat bread?
Rats."
She smiled a grin, but one full of malice. There was none of her usually bubbly self here. Her eyes had opened and she was staring directly at Toshiko now, as if nothing else mattered.
"So if someone were to lay out some breadcrumbs and wait for some rats to congregate around them... Well, what purpose would that serve? Who would do something like that? Well, going back to what I said earlier... Perhaps that person wanted to use magic in their plans? Perhaps that person's magic just happens to involve being able to control rats?"
"Then, all of a sudden, the locked room stops being so mysterious. The rats just ran out when the door was broken down and we were all distracted. They'd be so small, it'd be easy to miss in all the chaos. Regardless of whether a chair was blocking the door or not, it wouldn't matter. Because the culprit was using a proxy."
She closes her eyes again. "Just a thought."