Shadowman on Jack The Ripper Walking Tour

I took a guided walking tour while visiting London, so headed towards Whitechapel to join the group. We walked certain spots where Jack was known to have operated and dumped a few bodies. I was taking multiple images at a time on my iphone, but this one which was taken looking down St James's Passage had something very interesting in it. Two pictures taken with what must have been seconds apart, the first has a shadow figure in it, the second did not. Way too quickly taken for it to be the back of a person. But, they could have gone into a building or around that corner quickly? But I thought I'd post it anyway. What do you think?