Originally posted by SlickYamaha 
Although bad pictures, I think these show what I was talking about.
Look at the second picture. Your flash illuminated the next few rows of people, then started to fall off. The front row of people are in complete shadow, as is the front face of the stage itself, as is the person walking up the steps. Only the people *on* the stage are well illuminated. That can't be from your flash. I still say, the only reason the stage is overexposed is because the shutter speed was too slow, just as it was in the previous example you posted from the back of the room without flash.
In the first example, the ISO is all the way up to 6400, so indeed, you'd get more flash range than at 1600. So it might indeed have been the case. From the subjects' eyes, it seems pretty clear there *was* flash involved. But on more than one occasion, I've taken pictures that turned out to be illuminated by someone *else's* flash; I wouldn't rule out that possibility either.
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