Did anyone else see a shadow figure in the old Maplewood Hospital before they tore it down?

Went in there twice back in 2019 before the demolition crew fenced it off and both times something moved in the old ward on the third floor that definitely wasn't pigeons or settling wood. Second visit I had a mate with me and he saw it too, described the same thing before I even told him what I'd seen the first time - tall, no real edges to it, just kind of absorbs the light around it rather than blocking it, if that makes sense. Classic shadow figure behaviour honestly. Anyone else notice it seemed to avoid teh main stairwell and stick to the far corridor? Curious if that matches what others experienced or if it was just us.