...Oops. [He rubs the back of his head bashfully.] I guess you're right...but we don't want her to know that we know, so it's best not to get into the habit.

But anyway, we had all the proof already...we just put it together wrong. Eridan-kun's robes were bloody at the hem, which means whoever wore them had to be short enough for them to touch the bottom of the boat! Plus... Feferi-chan can see in the dark, and couldn't be Austria-san because she couldn't drag the body and she has a bad sense of direction.

We all thought Feferi-chan was framed because using her own trident would have been too obvious...but that must have been the point.