arcane bolt tends to miss all the time anyways. Shatter will massacre him, or a few cheap thugs with smashers. Really, like a bunch of indy commanders equipped just w/ smashers... or smasher and luck pendant etc.
I'm acquainted with shatter, but it requires earth mages, and in this game I have few and they are all very busy. Arcane bolt isn't hugely accurate, but fire at targets under 10 squares range you'll hit plenty, add in wind guide and you'll barely miss.