Hriston
Dungeon Master of Middle-earth (He/him)
You're misunderstanding. I'm not saying the shadow isn't in the area of darkness. I'm saying it's not a thing to be seen. Seeing a shadow is a kind of un-seeing because it's seeing an absence of photons, so you're not seeing anything. It's just looking at darkness.There's certainly room to quibble over whether, e.g., the moon can be "seen" in a solar eclipse or if instead one is seeing a shadow perfectly superimposed over the moon. Differing perspectives on what it means to be "seen" could definitely affect the relative complexity of opaque vs transparent interpretations of the spell.
I would emphasize, however, that the language used in the Heavy Obscurement rules is "effectively blind", so an observer can't see any shadows in the affected area either. You say you're ruling a silhouette to not be located in the affected area, and so bypassing that restriction, but frankly I don't know where else it's going to be.
I could make an argument that the silhouette is located on the outside observer's retina (or visual cortex, etc.), but that's no different than "seeing" anything else. We could go really deep and say that the silhouette is a concept that doesn't have a physical location at all, other than what our brain interpolates, but that's likewise going to be true for any image.
At the end of the day, from my perspective, the purpose of the vision/obscurement rules is to resolve what can be located visually, and a silhouette is definitely enough to locate a creature visually (at least at the ranges that are usually pertinent in D&D). So for me, a silhouette is generally going to be enough to "see" a creature.
And I would say that, as DM, you need to dial it back so that it isn't enough to "see" the creature.