Ideas and practicality.

Well, yes, that structure is the most sound, and we can get a competent sequence out of it. I do want to see as much made of the villain's escape as possible, but do we have enough of an escape route for the villain to fill the required amount of time? The villain walks off from the "murky corner," down the fire escape, along the alleyway away from the car park, then what? Will that fill enough time? Mind you, at some point in his escape we'll have the rose shot/ cigarette shot/ something along those lines.