How was this scene from Pulse (2001) filmed?

I'm not a filmmaker, but I've watched a ton of movies.

I recently saw this suicide scene from Pulse (2001) (around 43min in). I've replayed it over a dozen times, and I still have no idea how it was made.

In the scene, the camera follows a lady walking along the street. She turns around, and sees someone falling to her death. This was made in 2001, and I didn't notice any CGI, wires, jump cuts, mannequin, etc.. Can anyone explain? Thanks!