"So," Daylen begins -- feeling that the conversation has become akin to pulling teeth with the way Edgeworth resists him -- "you had a grievance with this man. Something happened, I assume, to bring it to a head. You retrieved the weapon given to you by this vessel and took it to his room with the intention of revenge. You did not use it, however, and at some point discarded it there -- so what happened then?"

If he discarded it, someone else might have used it -- the man, Marty, had heard nobody else in the area, though. Perhaps the person who used it fled the scene too quickly and quietly?