One way you might have gotten a different, maybe more interesting, result was to use two different color lights. That way, the shadows of the soldiers would be two different colors, but the intersecting head shadow would be black (i think). If you approximately matched the light colors with the soldier colors (but swapped, maybe), it might have added more again.
But hey, that's just my idea, and it probably would have been just as hard to get right anyway :)
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