This bugger use a full frame DSLR, with 70-200mm tele lens, sitting far from the stage, and point the f**king 580EX FLASH directly at the performers during the concert.. (not 90 degree up like you see now in this pic, even so it's still inconsiderate). The stage managers are school kids and no one controls the audience.
I am not against some newbie who has financial capabilities to play with the gears they can afford. However being inconsiderate to the stage is simply unacceptable.