First, I have to get the emotional reaction out of the way: holycrap!

Now that that's done, is the last time we've heard about the Marauders' Map when Dumbledore borrowed it to search for Tom Riddle? I don't remember off hand whether that was after TSPE or in Taboo Tradeoffs.

I'm a little perplexed at how Harry's medical treatment didn't seem to work; it sounded like it should have bought several minutes, but the action that followed didn't seem like it could have taken more than 60 seconds. I've only read it the once through, so I could be missing it completely, but the timing felt deliberate. (And all the ticks in 88 seem to emphasize the passage of time, though they could well have just been to emphasize the pressure).

Also, Susan knows how to effectively magic giants? That makes her smarter than Umbridge's entire team-to-sack-Hagrid in canon. I suppose it pays to have a competent defense professor (even if he is the most likely suspect for all the awful that just happened), and the director of the DMLE as a close relative.

I was pretty shocked at the Troll in the Dungeon line. That seemed like something that wouldn't be at all likely to happen with a RATIONAL! Voldemort, foreshadowing in Quirrel's first class aside. Apparently I never bothered to think about a decent motivation for such a plot; using it as a plot to get at the stone didn't come across as particularly clever in this universe, and I didn't search beyond that and just dismissed it as a silly idea. Oops. Of course, that brings forward the question of whether or not Harry will have to kill a Hungarian Horntail. I wouldn't expect it, but I haven't thought about it for more than a few seconds yet.