Nope. Not gaming and not cheating...BUT...that situation requires an immediate stop and a mandatory re-shoot. Shoot throughs are specifically covered in the rulebook and the RO should know that. The shooter is neither penalized or rewarded for this. (BTW, thats a mistake in either stage design or stage construction)
True according to USPSA rules, a clear answer to the problem. At Heartland it's not a USPSA match but a match originally intended to be a carry gun match. So...if a bullet passed thru a bad guy and hit another one behind him, win, win. But, if the one behind him was an innocent bystander, not so good. Fun match to shoot with a carry gun, makes you realize what limitations you really have when a little pressure is on you. This is a good example though of how almost all situations are covered in the current USPSA rulebook.