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Dogfights. Empty pools are ideal venues. Handlers back up to the walls, spectators can see over their heads, and it's easy to clean up...

That sounds disturbingly real.

In some areas the soil has a lot of iron in it and looks reddish (like rust-colored literally). But I'm not sure whether this is one of those areas, and also the particular shade of red here seems a bit more vivid than just rusty-red!

It could just be a tarp or a toy that melted. Pools always attract a lot of dirt and insects. Without constant maintenance it will look discoloured pretty quickly.

There's also construction-looking vehicles parked out front of these house so it's probably under renovation.

yeah, weird. Apple 2D shows completed pool, 3D shows backyard before the pool was started. Must be construction or something.

There's some strange vehicles parked in front of the house too

Too red to be real blood, it's probably paint. Blood turns near black if it's old.

Someone may be using it to slaughter chicken or lamb