Nobody knew, except for Draco Malfoy, and Harry Potter, what they had walked into that night.
Draco and Harry looked like they were going to their deaths.
Harry's was a metaphorical one, of course.
Draco, on the other hand, knew that Snape did actually use human potion ingredients from time to time, and could recite the 107 uses for human blood. At least he wasn't a virgin (thank Pansy!), there were 348 uses for virgin blood.
At least Snape was unlikely to set Draco out to catch a virgin.
Letting Luna Lovegood near the mistletoe was a mistake.
Neither of them knew what she'd done - because she hadn't been casting spells. She'd simply talked at the mistletoe. A lot.
Harry would have sworn that the vine wrapped itself around her hand, at points in time.
Draco was less prone to fancy, but he knew how much Snape detested Luna Lovegood.
Slytherins, in general, were more evenly split. Some admired the daft witch, others hated her.
Theo Nott, in particular, was some curious mix of both. When Goyle ginned up the courage to ask why, Nott had replied, "She knows what she oughtn't."
Draco Malfoy had watched her carefully from that day, and had noticed what Nott meant. He knew, as most of the Ravenclaws still didn't, that Lovegood would have made a fine Slytherin. Ravenclaws didn't actually hold the intelligence to wade through what she was saying. Oddly, Potter of all people seemed most likely to understand her (although the other Oddball of the group, Neville Longbottom, appeared to have been explained into submission. His understanding only crosses the surface, but Luna doesn't seem upset about it, at all).
Draco Malfoy doesn't think Luna Lovegood ever had a true friend in her life, and doesn't think she particularly wants one. Nor, he thinks, contemplative as usual, does she particularly seem to be troubled by the lack.
You could see, if you knew what to look for, the flashes of jealousy on Slytherin faces. Splash in a pan, shades of quicksilver. But they were there. Some wore them looking at the Gryffindors, and others at the Hufflepuffs. Few wore them looking at the Ravenclaws - they were similar enough in temper to get along well enough outside of class.
With the Dark Lord on the rise, all friends were reconsidering Slytherin allies. And enough of House Ravenclaw wanted to stay true neutral.
Draco Malfoy could pick out the Slytherins who were most aligned with the Dark, and the Dark Lord in particular (His mother's house had been moderately aligned with the Dark Lord, and had brought the Strength of many Dark Houses to him.) He didn't know, and didn't particularly want to know, about the other houses.
He was a prefect, it was his job to keep his house in line. That meant playing with kid gloves at Hogwarts, and dissuading those with more Gryffindor tendencies, because there was always one.
No, He thought with exasperation, You will not impress the Dark Lord by murdering Harry Potter in his sleep. You have not even the first password, and you just told your plan to your entire year's cadre of boys.
There was always a fool, in every year.
Looking around, Draco hoped his year's wasn't him.
[a/n: Well, we moved from a third person omniscent to a much closer Draco Malfoy, who's worried about Luna, and what she's likely to have done. Leave a review?]