Katherine's all suited up and ready to blow up MEDUSA when the Engineer security team blasts in and kills her dog. In case you weren't sure they were evil already.
They're about to take Katherine and Bevis into custody when Chudleigh Pomeroy and the rest of the Historians show up with guns.
The Engineer taunts them, "We'll make you history, since history is all you care about!" (32.35). Ugh, back to witty repartee school with you, guy. Lamest comeback line ever.
A huge fight breaks out, and a bunch of body parts are blown off.
When the smoke clears, all the Engineers are dead (we hope the guy with the cheesy one-liner is extra dead), and so are Weymouth and Dr. Arkengarth.
Pomeroy shows Katherine a secret stairway that goes all the way up to where MEDUSA is stored. How convenient.
Katherine scales the stairs while the Historians stay behind, ready to face off against any reinforcements.