Is the game going ok for everybody? There's potential for combat in the near future, as you may be expecting. I've run Ouroborous combat before. It's quick and can be scary for people who are used to having lots of hit points. It's generally a good idea to retreat if you're HURT, unless you have a higher LK score.
Following that thought, asymmetric combat is a good idea as well. For example, Osan has no apparent missile weapons. Tobias has a short bow. Of course, the risk of a missed shot from a distance is that Osan will have space to hide, run away, etc.