Once they were in their Mecha, the three Pilots just waited to see how the battle was going. The Koleska should be able to handle this on their own, and the Destroyers would keep the Arisen away from the planet, so chances are they wouldn't be needed unless there were additional ships beyond the once Cruiser Class Arisen ship, which had arrived here already.
The Arisen backed away from the Destroyer when they realized that it was protecting the planet and engaged directly with the Koleska Mecha.
That was the best-case scenario, to convince the Arisen that they were a defensive force and that they would only attack when they were provoked. It would make things harder on the Koleska, but as far as the Arisen knew, Cleansing Light and Shattered Pride were part of the Station's defence force, so they wouldn't be shocked to see them during the assault.
