They are standing at the door of the bus. He tall, proud, back straightened, one arm curled protectively around her shoulder, eyes staring defiantly out at the sidewalk, as if daring it to draw near. She half-turned to him, leaning, her head nuzzling into him, her face hidden by her hair. As though the world had perished and they were the only the survivors, a twilight Adam and Eve awaiting banishment from life. As though they stood on the sinking deck of the last ship and watched the sun of mankind set in the West.
21st street. The doors fly open. It is time. Slowly, as though moved by some distant music only they can hear, they step off the footboard, side by side, and are swallowed by the night.
P.S. My apologies for the poor quality of the video clip (see link above). It's the best recording of that scene I could find online.