The FE should have shut a pack off to reduce the electrical load and not touched essential power since it was powered by #3 gen. He just came back from flying FO on another airplane and was being given a route check by an FE check airman so knew between the two of them they would figure it out. It was kind of like driving a 56 Ford vs a 2010 Lexus and the engine quits. I could fix the Ford.