The photo meets the challenge, no doubt. But it doesn't really go much beyond that. The photos that scored high in this challenge had more than just the shadow. This picture needs something to give a context. The "Hitchcock" comment is true. I'd like to see some other element of the situation, the potential victim, more of the surrounding room, etc.
The choice for black and white is a good one. Of course there's not much color to a shadow on a white wall anyway.
The frame is a little too thick for my liking, but that's just my opinion. Others may like it. I've found that less is more with framing on DPC challenges.
The best trait of this photo is the composition. You fill the frame well guiding the eye up from left to tight then down to the bottom right.
I hope you find this helpful. Good luck!
Feel free to contact me if you have any questions.