"Nearby, a Russian axe is found, covered in dry blood. A brick with the Russian words for 'You are next" is found shoved up one of the Duneshifter's anus" I would call that a trace of the murderer.
Cool, cool, they weren't snuck up on, it was a swift skirmish in which the martial skill of the murderer/s prove superior to that of the Duneshifter. They did put up a fight, just not a very good one.
Doesn't prove anything as the Russian language is very common in this rp now. Back then, Death Cult, Muscovy, and Bloodsworn had it as an official language, which makes up quite a lot of the continent. As for the Russian axe, that doesn't prove anything either. The Russian axe is a common weapon. Anyone can get it.