Replayed Sandstorm and got through a Dark Ravens playthrough, and I want to say great game so far.
SPOILERS (!):
Torsten is acting very sus; insisting on the raid and giving weapons away for free is really out of character for him.
As the chief, he definitely has the ability to pull off an assassination. The motive is also there, in that this incident weakens both rival clans through the offing of the Bears' leader and forcing a death tournament, along with removing a potential Ravens' ally who was backstabbed during the raid.
The cliffhanger of how the village is relatively undefended is interesting. Maybe Torsten is working with the guys who betrayed the Jarg?Jorg? fellow (also explaining how he obtained the blade that was planted at the crime scene)? And I believe that he was the one who was quick to accuse Nox of having foreign ties.
Wonder how Katja fits into all of this...