Shadow-person (?) moving from up to down stairs

One of the investigators saw a faint shadow movement on the stairway going from up to down

wish there was a way to add contrast..

it was more noticeable when reviewing on his camera.. im not convinced, when looking on my computer, what do you see?

I do see some sort of movement behind him, not a full shadow, but I am also not sure why the screen is blacked out for a few seconds ( I did not cut the clip) all of us, were in the foyer area (only 3 that evening), and no one walked in front of the camera.

sry not seeing anything here

it's very fast like the last 3 seconds of the shot

I do see a faint, quick movement on the stairs at the end. If none of you were moving, it is interesting. have you ruled out the possibility of car headlights passing by outside?

yes, when vehicle comes from outside ( its a one way street, you can clearly see them in the window nest to the stairs)

sorry nothing paranormal here

now the more I look at this video ( and its not very high resolution)..the female investigator who is to the right partly out of shot.. the shadow seems to be moving to the right as she does, and I think I see the banister darken too, which would indicate its not a shodow person to me, does anyone else see that?