A couple of the pictures from higher-up show the oilslick-like spread through the shadows of the buildings - the main incident started at 6:30pm local time. Once the contiguous areas of darkness get large enough, I think, the limbs, tentacles and larger things start extending from them. Like, if Night Terror could just manifest the tram-sized centipede thing whenever, they’d have been far more dangerous. And that’s saying a lot.