I want to know what others think of using regular troops to surround and kill inquisitors. Do you feel it is an exploit or a legal "arresting the inquisitor" maneuver?

[For those not in the know, someone else found that you can kill an inquisitor by surrounding its square on all 8 sides, then moving in a 9th army unit onto its square. Since the inquisitor cannot go anywhere, it dies. I used it yesterday to avoid losing a high command general on top of a large stack. It felt too easy... I'd rather have an assasin do it, but I've not ever succeeded in killing an inquisitor that wary.]