You're most welcome, Angelina!
I've never tried playing guitar with a bow, but I'd have to think one is somewhat limited on playing individual notes (except on the first and sixth strings) because the bridge and nut are essentially flat, whereas they're rounded on a cello or violin, allowing the bow to touch only one string at a time. In fact, as I recall, Page plays mostly chords while he's playing with the bow.
When he gets to the percussive part where he's actually striking the bow against the strings, he really utilizes the variation in tone from one part of the scale length to another. Plus, as hard as he's hitting them, I would have to think he's smacking the pickups in which case you should be able to hear that, too. (I used that in a local production of Jesus Christ Superstar a few years ago. As Judas hung himself, I did a pickscrape and then hit an Em chord and divebombed, allowing the strings to bottom out on the pole pieces of the pickups for an audible little "click" at the end.)
One other thing Page is doing on that percussive part is using some kind of delay so each strike is followed by little echoes.
Hmm, I'll have to go back and watch it again myself now that you've piqued my curiosity!