Aight, this would probably be clearer with diagrams, but there's something that comes up a bit, especially when you have a 40mm+ base model tucked against the wall of a relatively large building, and relatively far away from the corners. Said model is facing the wall straight-on. As another trooper comes around the corner of a building, they're going to see the part of the tucked model's base that isn't in its front arc first - so they have LoF to the tucked model, but the tucked model does not have LoF to them. But! LoF in Infinity is reciprocal - with the main exception of not being in the other model's front arc. So technically the model that's poking around the building is in the front arc of the tucked model - it's just that all possible paths of LoF from the front arc of the tucked model to the active model are blocked. Because the active model is technically in the tucked model's front arc, and has LoF to the tucked model, does the tucked model have LoF to the active model? Or does the total cover somehow prevent this?