Cut to the Summers home. Buffy is tossing and turning in bed, sleeping fitfully. This is one of those dream things, so I'm just going to summarize. Her dreams are a mixture of sex with Spike and the murder of Katrina, and I'm not really one for dream analysis, but notice how she's dreaming of two very disturbing things? There might be something to that. Buffy wakes up breathing heavily.
Cut to Dawn's room. Buffy enters, her coat on, and sits on the edge of Dawn's bed. She watches Dawn sleep for a moment and puts her hand on Dawn's arm. Dawn stirs, and Buffy says, "I love you. You know that, right?" Dawn is immediately suspicious of any sort of attention from her big sister, and sits up. "What's wrong?" she demands. Buffy tries to tell Dawn that despite her shortcomings, she loves Dawn and always will. Dawn is wigged, and Buffy is forced to explain about Katrina. Dawn reaches her arms around Buffy, all the better to hug her. Buffy says that she has to go turn herself in. Dawn wants to know what this all means. She has a horrible realization: "They'll take you away. Won't they?" Buffy just repeats that she's sorry. Dawn calls her on her bluff, saying that Buffy isn't happy here with Dawn, never wanted to come back in the first place, and just wants to go away again. "Well, go," she finishes in tears, "you're not really here anyway." Dawn flounces out of the room and Buffy looks down at the coverlet forlornly.
Establishing shot of Sunnydale police department. Pan across to the alley. Buffy is about to turn the corner and march herself right inside to turn herself in when Spike steps out of the shadows and throws her down in the alley. She's all, "I have to confess." He's all, "Confess what?" Which is pretty much the essence of their differences right there. He thinks that they won't believe her, what with the demon time-looping element. Which really is SO beside the point. Buffy counters that she'll "show them." Spike: "Show them what?" Buffy gets a horrified look on her face and asks what Spike did. He replies that he made good on his promise to take care of things. She's repulsed. He doesn't get it. "It doesn't matter now. No one will ever find her." Offscreen, we hear two policemen talking about how they found a body in the river, "washed up half a mile from the cemetery." Spike dumped her in the river? Putting aside the notion of how very, very wrong it was to dump Katrina's body somewhere, let's just think about what a poor choice of disposal method that was. Guy lives in a graveyard crypt. Couldn't he have buried her in the cemetery? Nobody would ever look for a dead body there. Sheesh.