One thing that is beautiful about Antonia is her Christianity, which I get is confusing, but makes a lot of sense once you realize that, 400 years ago, there weren't witches. They were just called women. In the same way that bisexuality is a "phase" for women and damnation for men in our modern world, women's spirituality was beside the point for so long that you could act just like a witch, but as long as you did it in the red tent and kept that hair covered up, you still belonged to the Christian world. (At least up until the New World, when suddenly they decided that women's sexuality and spirituality were some interchangeably terrifying thing, and we're still dealing with the fallout from that one.)
So Antonia is taking a firm Christian tack that you might overlook if you try to connect her spirituality or intentions with Wicca, because she's not one of those. (She doesn't even really seem to have a concept of what witchcraft means to Marnie and the others, because she doesn't need the distinction between God and Goddess to prove her point that we do in the present day.) She is carrying out evangelical spiritual warfare, in God's and Descartes' name:
"Vampires are not immortal. They're only harder to kill. And that is where our humanity is our great advantage, for our human spirits are immortal. I stand before you as living proof of this very fact. I have matched my human spirit against their emptiness, and I have won."
They're zombies, in other words: Emptiness equals expendability.
Sam surprises Tommy at their house and attacks immediately, and it's sad, but only because the actor is so good that he makes Tommy's stuttering apologies and pathetic attempts to explain how it all went down seem almost legit. But the Lunar aspect of things means it wouldn't matter if Tommy sat down and explained every moment of the last day to Sam, because that was the unforgivable one. So Sam's dark passenger shifter-self takes over, and one more time he strangles and kicks Tommy out the house altogether. Just like he does three times a season.
You even get to see Sam playing out the "assumption of conspiracy" angle that powers the Witch War, because in his formulation, Tommy was actually trying to eliminate him and become Sam: The bar, the life, the girl, everything. That once he killed their parents he became a killer, and Sam is next. Which is a compelling narrative, and takes a lot of the sting out of Sam's hysteria, because it's Tommy: There's no real reason to believe otherwise, if we hadn't seen how it all went down. How tempting it would be to actually do that, if he didn't love Sam so painfully much and so poorly.