Exactly."you are left with a feeling of emptiness when the film ends and you discover you have lost those people. That you never had them" - the way I interpreted it was that this is exactly how Victoria feels about these people who she has only met a matter of hours earlier, once the adrenalin has subsided, and so you as the viewer are sharing in that emptiness with her.
I think that this is a necessary consequence of a realistic portrayal of some kids meeting in the street in that way.By about 30 minutes I found my attention wandering a bit,
But overall you enjoyed it?