A glimpse of what we saw

Exploration Stage: Historical Museum
From: Mr. Black
Description: I saw what looked like a shadow, but no signal from the motion sensor. What's going on? The investigators also detected that the exhibit moved and were able to take some pictures. Bring the photos here. Let's take a look.
Completed: There is a strange light and what looks like a human silhouette in the picture, but the picture is too blurry to identify? Hmmm, is this a spirit? I don't believe in any kind of witchcraft, but I can't help but investigate.