It was planetfall day.  They had worked for years to reach this moment.  Dodged and weaved.  Made unpredictable movements.  Strategized.  Today was the day it would all pay off.  All the decrepit parts of the aging station could now be replaced; whole new sections could be built.  With this mass at their disposal, they were indestructible.  The massive evnergy banks stored from the nearby dwarf star allowed them to tear into the planet's crust in a manner of hours.  Their window was small, they would soon have to retreat or risk being predictable, but for the present they grabbed a good chunk of the planet's crust and made their escape.