Never been to Brauer Mill specifically but shadow figures near old industrial sites are one of the more consistently documented phenomena in the literature, which is saying something given how much noise there is in this field.
The thing that gets me is the pattern - these aren't random apparitions. Old mills, foundries, places where workers died under heavy machinery, they produce a very specific type of residual activity. Low slow-moving figures, peripheral rather than direct sightings, sometimes described as having no discernible features at all not just obscured ones.
Did you capture anything on camera or audio? Even thermal would be useful here. Eyewitness accounts without supporting data are genuinely hard to work with, and I say that as someone whos spent years collecting Bigfoot evidence where documentation is everything.
What time of night were you there and how many people witnessed it? Also whether anyone felt temperature drops or that pressure sensation behind the eyes, because that combination alongside visual phenomena is worth noting properly.