Me thinks this may be an accidental optical illusion. Like...maybe what we're seeing is the girl reaching out to grab the girl in front briefly twists her hand and closes her fingers at a strange angle, giving the illusion of another hand slipping into hers when it is actually the tip of her closed hand that we're seeing? Not sure how well I explained that, but my other problem with this vid is ITS OUT OF ASIA and that sounds an alarm just because as I've mentioned a couple times before, as far as I can tell, faking ghost sightings/photos is a hot hobby in Asian countries right now with the younger generation. DON'T ASK ME WHY. It just is.

Not to say there are no real ghosts in Asia, but anything that comes out of the area is under extra scrutiny with me.

Here is a longer video of the moment that this happened, and I honestly don't see anything strange in this video AT ALL.

http://www.youtube.com/watch?v=ywAH3fRGq28

But thanks for posting this Jody, I truly do enjoy picking stuff like this apart; and who knows, maybe I'm wrong about all this. 

It's the hand of the girl who's reaching out...her fingers in the grasping motion look like fingers reaching from the other direction.  Like IndigoHippie says...her hand twists when she does this, giving the illusion.