hmm..
its probably possible, i think use yamato gun is a custum AI script which you may have to download, otherwise check x-tra editor (if you have it) and look in the ais scripts.
if its there you should make,
a) a location follow one of the units
b) current player brings (hero) to (location following other hero) Create 1 Bc (and arbiter??) and use the ai script to fire at the location you want..
i hope that helped..
ill give it in more detail if it didnt
