This is DK reply to my tweet as to why Gravus suddenly looked like thana and all psycho.... Realization of his inescapable death rattled him; someone used to pulling all the strings can rattle when the tables are turned.
Sure...now see if he can come up with an excuse for why Meetra turned into a wimpy Revan fangirl.
Still, it does makes sense, at least. TVTropes even has a term for it...Villainous Breakdown.
Meh, maybe I'm being unfair to DK. I did like Annihilation and the Bane books...I guess I'm just still angry about the Revan novel.