Massed enemy in the muster bay
In the muster bay (after the boarding battle), trigger the checkpoint that starts waves of enemy arriving, then leave and wait until they're all present. Now you can have some fun with them! One idea is to move up to the platform above and whittle them down from there (particularly with the needler). Another idea is to run back and apply the active camouflage, then return to the room and wreak some havoc while still cloaked. If you want to jump down into the room, it's easy enough; you can land on the Wraith to reduce the fall. Of course, you can also opt for a no-nonsense charge into the room and see if you can clear the whole festering place out with close-quarter combat! Watch out covies - cyborg in the house!