Violet and Vivian, with some assistance from Tate, fighting off the intruders in "Home Invasion". Bonus points to Violet for telling one of the intruders off before knocking them down, and later luring one of the intruders to the basement for Tate to take them out. Vivian beats the remaining intruder in unconsciousness with a ceramic bowl.
Constance and Moira forming an Enemy Mine, and then later with Larry, killing Joe in "Open House" - Moira seduces him before biting his dick off during a blowjob, and Larry suffocates him immediately with a plastic bag.
Constance: Make sure he's off the property before he expires. I wouldn't care to encounter his carcass ever again.