Mate I've been staring at that photo for the last twenty minutes and there is definitely something in the doorway on the fourth floor. The shape of it is what gets me - it's got that classic tall, featureless silhouette that shadow people are known for. Not a reflection, not pareidolia, the edges are too defined for that.
Waverly Hills is one of those places where I genuinely believe the residual energy is strong enough to produce visible phenomena. So many deaths in one building over such a short period of time, the place is basically saturated.
Can whoever took the original shots post the unedited RAW files? Would love to see if the compression is adding anything weird or if that figure holds up in the original. I've looked at enough of these to know when something deserves a second look and this one does.