I don't fancy a description to accompany a picture, this is not journalism. I prefer to let the viewer work it out.
But in this case the why does have an added value.

This is at the Making of Harry Potter Studio Tour, near London, just before entering the actual studio.
Enough said.

Technically, another challenge, I had to react super quickly, he just popped in view, looking like he did, so I just snapped. Hence the tilted frame etc.

Never mind, content always wins over technique in my view.