Neutron: Slap a brick of primed C4 directly onto the end of the plasma cutter

ResearchDirector can obliterate any mostly-motionless object in seconds with that drill. RedGiant is going to have to give way soon, through no fault of his own. You don't have time to assemble your preferred weapon, so you grab your final bomb and do the best you can.

RedGiantWhiteDwarfNeutron: Dramatic lens flares of your own, because shit just got real.