Buffy and Parker (and I typed "Xander" there at first without even realizing it) are in the hall in front of her dorm room, making pre-kiss small talk. Just as they lean in, Willow (holding her neck) and Oz come running towards them. I hope Willow bleeds all over that awful coat and has to get rid of it. They tell Buffy they need to talk to her about Harmony, who is "paler" since her summer vacation. It finally dawns on Buffy that Harmony has been changed into a vampire, and she dismisses Parker. I just wish it were permanent. As Oz dresses Willow's wound (aw), Buffy remarks that Harmony must be "dying without her reflection." Heh. Some throwaway dialogue about Harmony's potentially mythical boyfriend so Buffy can comment that he "must be, like, the most tolerant guy in the world," which leads us to the next scene.
Harmony approaches a figure who is trying to drill through a wall with some sort of power tool: "Hi, baby. I'm back." purrs Harmony in his ear and as that masked man removes his mask we see that it's Spike. Huzzah, it's Spike! As Owen said, "I'd even watch a Buffy-Boy Meets World cross-over event for maximum viewing time with Spike."
The camera pans down underground from a street-side shot, as if Sunnydale were a giant ant farm. Spike is leaning on a table discussing blueprints with a vampire who seems to have been a structural engineer. Spike wants to make certain that Brian, the other vampire, is sure that they are tunneling in the right spot, and to get his point across he slams Brian's head onto the table and pins him there. Harmony bounces up and starts whining at Spike about killing Willow, and he reminds her that he is there incognito so he's not going to trumpet his presence to the world by killing the slayer's best friend. The whole point of the rest of this scene: Spike finally agrees to take Harmony somewhere tonight, but Harmony is so annoying that I'm not even going to bother with the details.