What actually went through my mind about what you “saw” was I pictured you in a horror movie, walking past a door way down a hall, and standing in the door way in your peripheral vision was a black hooded omen which disappeared as you turned to properly look at it. The when you were out near the park I imagined you saw it again by the swings, but this time it was a black-hole like vortex in its chest that was sucking (or consuming?) things in.
Urgh. Creepy.

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