I don't know exactly how the torches look, but I can imagine they have an indoor GPS setup in the stadium. Couple that with a position-dependent program that ea

I don't know exactly how the torches look, but I can imagine they have an indoor GPS setup in the stadium. Couple that with a position-dependent program that each torch has. The actual program can be started, paused or stopped using an RF signal of some sort - so the torch actually knows its position and just sets itself to what should be running on the virtual, stadium sized display.