So I proceeded to interrogate him, with the help of darthblitzkrieg. He screamed and yowled in pain and frustration, but didn't tell us the location of his secret bases or plans to acquire WMD, or reasons for wiping horribly in Black Temple. He twisted into a pretzel, he even spun his head around and his eyes glowed, just like in "The Exorcist". But we couldn't get him to talk.
Torture instrument: Comb did produce an appalling quantity of excess hair, though.
Possible future plan... use Torture Instrument: Bath.