Shadow Person

by Chris
(Canada)

What is that????

I was doing a video conference with this guy I know. It was a steady streaming video, it took still shots every 5 seconds. Everything was normal for the first 10-15 minutes, and then in 2 frames this shadow appeared behind him. I asked him what it was, and he has no idea what I was talking about, until he looked back at the video footage. We still don't have an answer. What do you think???