Some more progress. Want to start to consider it approaching final now. Itching to get at the texturing
The primary fire is that the small nozzle positioned just behind the suspended ball of plasma will somehow (with Unreal magic!) knock a small portion of the plasma out of the ball and accelerated between the rails to leave the end at great speed.
The secondary fire, the entire ball of plasma will be launched. Those large panels on the bigger of the two shapes will flip open to vent coolant around the rails afterwards. The ball holders will quickly accrue another ball of plasma in the suspension chamber.