Well, not necessarily the cause of death, but Jonathan has that gash on his face. It could be some other object, but they'd have to apply a lot of force or it'd have to be sharp enough to cause it. If it was another laser gun, we'd see searing on his flesh. So I think it's possible a knife or a sword or something likewise stabby was probably also used.

... As for our victim, I think it's clear what the cause of death was. He was hit. It's possible they used the butt of the gun to hit his head.

My point is this: it seems likely the killer had two weapons. ... Why? Why, when the laser gun would be more than enough?