You did well to stay where you were long enough to see the impact. I would have got someone to vaguely watch console meters whilst I ran out with a long extension reel telling them to get their power somewhere else.
There was no other place to get the power from.
scenario:
- ACS Relay for Life
- high school football field
- football field is surrounded by a track
- stage in one end zone next to goal post
- snack shack (where the power was) is located outside the radius of the track
- wire from the snack shack to stage is suspended 20' off the ground to allow the relayers to walk the track
The shack had four twenty amp circuits available (the fifth circuit was used for shack lights and a fridge)
The electrician ran a line from one circuit to the stage and taped over that line's outlets in the shack.
20 amps were a bit tight but we made it work....until one of the volunteers removed the tape from the outlet (in the shack) and plugged a coffee urn in....(there were four urns; one in each circuit).
I asked the volunteer if she could put two urns on one circuit to free-up our circuit. She said that her boss told her to plug the 4 urns into separate circuits...
At that point I threw my hands in the air, told the activities director that the stage volume needed to come down a bit and rode it out.
My rig wasn't big (two Crown K2 & one K1 power amps) and we got through the gig.
I love volunteers....