I think that was one if you look at the right side of the stage, directly under the lamp you can see side stage. (Photo credit to someone else, not mine)
Here it is in one of my photos, right there at Bono.
I can say that the floor was shaking like crazy and any video footage would have been highly affected by it. I remember somewhere between I Will Follow, Out of Control and Electric Co, the floor was shaking so much, my friend and I held on to each other to keep from falling. I remember thinking that if the floor collapsed, at least I was having the time of my life.