Angel apparition at a U2 concert?

On the opening night of U2's 360° world tour in Barcelona, Spain, two "beings" were photographed hovering above the crowd. This happened during the closing song (Moment Of Surrender). The date was 2009-06-30 and they've never been seen since. Here's the link to the original picture posted:
[link to www.twitpic.com]

Others attending the same show claim to have seen them too. It can't be a photoshop or light reflection problem with the lens because the "beings" have been captured on film as well. Here's a clip filmed from a different angle. They can be seen at the top of the screen from 4:21 to 4:25 and 4:41 to 4:47 (right after Bono sings: I did not notice the passers-by...)


Analyzing the picture it's easy to see the figures are strikingly similar in appearance while not being precise copies of one another. This rules out the possibility of it being a cloud of smoke. *IF* it were to be two angelic beings it looks as if they're blowing some sort of trumpet/horn held in their left hand while the other points to the crowd below.