I suspect the shooting is a little bit of a Red Herring. One of the contracts the Eebs took out prior to their difficulties on the pointy bits of the Erlking.
What I think is more interesting is the voices in Harry's head as he sinks. I think the headaches of the last few books are the brain damage from the White Court battle finally healing; and through that, Lashiel (or rather Lash) returning to the already cramped confines of Harry's Brainpan. With the advice of an un-fallen fallen combined with the powers of the Winter Knight and his own not inconsiderable abilities, Maab and Maeve are going to find their pawn has become something considerably more potent and hard to control - this raises the possibility that Fix was the one doing the shooting, as hinted at in an earlier book; but I doubt that is the case.
Finally, I think the title Ghost Story may be another red herring; hinting at the plot, rather than Harry's personal condition.
What I think is more interesting is the voices in Harry's head as he sinks. I think the headaches of the last few books are the brain damage from the White Court battle finally healing; and through that, Lashiel (or rather Lash) returning to the already cramped confines of Harry's Brainpan. With the advice of an un-fallen fallen combined with the powers of the Winter Knight and his own not inconsiderable abilities, Maab and Maeve are going to find their pawn has become something considerably more potent and hard to control - this raises the possibility that Fix was the one doing the shooting, as hinted at in an earlier book; but I doubt that is the case.
Finally, I think the title Ghost Story may be another red herring; hinting at the plot, rather than Harry's personal condition.