Apparently that's the Swedish artist Elliphant, who had performed at the same festival earlier that day.
Yes she was, and as far as I know her appearance on stage hadn't been agreed in advance, as it should be in these cases... But anyhow EUROPE have been the usual fair players and reacted with wit and sympathy!!!
I thought to have filmed Firebox with that dive of Joey's into the crowd... unfortunately it didn't get saved in my camera And I merged all the rest into just one video here. Overall, can't you perceive how HOT it has been there?!!??
You may know this one: "...and I've been waitin' for the angels to knock on my door"