When Giles discovers something that will deactive Spike's trigger, we are treated to memories of Spike before and after he was sired by Drusilla.  Later, Giles leads Buffy into a cemetary for more training while Principal Wood deals with Spike in his own way.  Finally revealing to Spike that his mother was one of the Slayers that he killed, Wood is out for revenge.  Spike, beaking the hold that the trigger has on him, beats Wood, but things will not be the same between Buffy, Wood and Giles because of it.