What is the most common cause of engine surge other than advancing the throttles?
Whilst what was said is vague, I do not interpret what he said as an engine "surge". He (apparently) said a "surge of power" (common language phrase), which seems very different from an "engine surge" (technical meaning).
Anyone who knows a modern Airbus will be able to associate a rapid pitch up (apprantely into a stall?) with a subsequent "surge of power"... but I will not speculate
NoD