You're not giving enough information about your scenario.  What time of the day is this combat occurring?  How much natural lighting do you want to influence the mood of the scene?  Is the flame a major focal point or is it just providing additional illumination?  Superfly or Firefly?

And the reason I ask about which render engine you have decided to use governs how you approach the lighting situation.  Using Firefly?  Forget about using an HDRI as a Poser background unless you are considering using a skydome.  If you are placing your combatants in a daytime scenario, I would suggest incorporating an infinite light varying in intensity depending on the time period of the day.  For your flame illumination, you have 2 options, mesh lighting or the point lights as you describe. Depending on the Poser version, mesh lighting could be messy with fireflies permeating the scene.  Point light will require precision to pull off a flame illumination as Boni commented.