The "This is War" panel--words and image--is one of the handful of moments from Season Eight that has stuck in my mind. I viewed this as Buffy's continuing evolution toward being a pure Slayer (like many or most before her). The "Kill every single one of them" panel (in Part Four) is another example. On the one hand, her "take no prisoners" attitude makes her a stronger Slayer, since fewer vampires means fewer opportunities to be killed by vampires (especially those you should have killed the first time around). On the other hand, seeing things in black and white means you don't see shades of gray. With vampires, this is no problem, because vampires are demons with only some semblance of humanity. With other demons, and with evil humans, that's a problem, since not all demons are evil and Slayers really shouldn't kill people. But Buffy's cold eyes and voice in the aforementioned scenes lead me to believe that there's the possibility that she could cross that line if pushed. She's already proven that she was willing to sacrifice Robin Wood--a human--to Spike if he tried to disrupt her plan to defeat the First Evil. That might have just been a judgment lapse, or she might become ruthless to the point of bloodthirstiness, and Twilight's fears will become justified.
The "This is war" panel also has stuck with me. It's one of those moments in BtVS that literally grabs you and forces you to stop and rewind, say, wait, did she really say that? It's along the lines of Buffy in the past saying, pretty defiantly, "I
am the law" in the faces of her friends who wanted that not to be true.
I was trying to think of when exactly it was that Buffy entered on to this path toward self-awareness, for lack of a better term. Obviously she's struggled with the true nature of her calling since Season 1, when she told Giles she quit because she didn't want to die so young (I think that was the first, real, dramatic scene in the show that actually touched on the subject of Buffy vs. Slayer Calling, also).
But really, I think she started to embrace the calling as early as Season 2, when she was forced to kill Angel. I don't think Buffy could have done that without the knowledge that she did it for the greater good, because it was what she was born to do. She may not have wanted to face The Slayer (obviously - look at the following ep, "Anne"), but she started to reluctantly embrace the idea that she walks in two worlds, not just the one that she wants to and the one she wishes would go away.
And I think the question gets kicked squarely through the goal posts with the Dracula ep. Here, she's facing what she is... and she kinda likes it. It's a trip, she digs the power, she digs the awesome responsibility, and she's starting to see that she IS the one keeping the peace. It's because of her that the town hasn't been sucked into hell. She's maybe starting to think, "The Slayer is what's keeping us all alive. And I'm the slayer, and I'm pretty good at it. My law works: see a demon, kill it. Keep the balance. Good versus evil. We're all happy and breathing, so it's working, right?"
As the years go by, this happy objectivity starts to turn into a hard, indisputable truth: I'm the Sheriff of this town. If you break the law, you will pay. She's embraced more of her Slayer-ness than ever before, albeit at this point, she may not quite be aware of just how cold and distant she's become. The Slayer is keeping everyone alive, and Buffy's taken a backseat by the end of the TV show; and then when Season 8 starts, it's clear she's Slayer almost full time, and barely part-time Buffy, almost a complete juxtaposition of when we first met her in Season 1.
So when I see a panel where Buffy says "This is war" and she intentionally kills a baddie in a gruesome way, or she ignores a group of people who need her help, so she can serve the greater need instead, or she tells her people to cut off the streets, chase all survivors, cut them down as they flee, kill them all? You bet it's attention-grabbing. Over the years, it seems like Buffy has been positioned to start being the opposite of what she was. She's been opposed or left by all the people who were her closest friends, so yeah, she probably at this point feels like she's going to throw herself into her work and embrace it full-on. So far, this hasn't had good consequences, and probably has even worse consequences to come.
Buffy's ultimate battle may actually be with herself.