I think I saw bits of Faraway, So Close on SBS once... then I saw bits of Wings of Desire, then I saw City of Angels (mediocre but I did like the falling scene), then I watched Wings of Desire properly... I dunno why I'm replying to this since I haven't actually SEEN the video clip to Stay (curses! I wanna see it... Who wants U2 to release a video full of film clips for their songs??), but the last line(s) in the song remind me powerfully of a poem we did in German Literature...I think it's by Goethe, I can't remember what it's called, but the last line of it stuck in my mind (even if the grammar didn't)... It's something like
"Auf Himmel zu die Erden
Falln sich die Engel tot."
Which means approximately 'From Heaven to the Earth, the Angel falls dead'... An angel falling isn't a positive experience, in the broad picture, since you have this heavenly being, all grace and light and virtue and everything, descending down to Earth, to our level, us grotty, crude, often unpleasant humans... but I guess the point there is that the power of love (both human and angelic) is enough to bridge those boundaries and make it worthwhile...
Sorry again!!
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Deeper into Black
Deeper into White