I just realized something: when BL Firestorm killed Ghehenna in BL3, why was she not risen as a BL? Yeah, she was a pile of table salt by then, but that didn't stop BL Dr. Light from rising from a pile of melted wax!
Thread ahead: Comics Shipped 11/11/09 (One major character death; spoilers) Next thread: Comics Shipped 11/04/09 (spoilers) Previous thread: Comics Shipped 10/28/09: One of the biggest weeks of the year (spoilers)
I don't want to spoil anything here either, and I won't. But about a third of the way through the book, I was pretty sure who the half-blood prince was. I got that sense of satisfaction at the end, the "You guessed right!" moment.