Break the fingers of his non-writing hand one at a time until he wrote down the notes, THEN hand him over to the police? Works for me! <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
What if he refuses to? In the comic, he's an extremely unrepentant and smug [nocando]. Instead of repenting when told the police were coming, he flew into a rage and tried to capitalise on the assistant's guilt.
They're usually the ones that break fastest when you start hurting them. A serious egotist only enjoys pain when it's inflicted on other people...