I dunno about that. If you can climb up to one window, you can probably climb to another.

Susan brought up a theory that I think might explain everything - the killer poisoned Minatsuki, which caused her to become disoriented enough that when she tried attacking them, she only wound up hurting herself. It could also explain the vomit and the eye dilation, and why our killer got away cleanly - they didn't need to wound her at all.

The question is...how do we prove who did it?