Who is the Mystery Man at the End of "After Hours"?

There's a cut at the very end of Martin Scorsese's "After Hours" that shows a mysterious figure wearing a long, black coat. This man was added into literally the last second of the movie and he's been driving me crazy for the past few weeks... so I'm going to try and finally figure out exactly who the mystery man in the black coat is and what he represents.

Have a better theory than mine? Let me know what it is!

Видео Who is the Mystery Man at the End of "After Hours"? канала A Million Movies