Super burst flash?

Shooting for a high end client tonight, private event, but the Mayor, Governor and others were there w their own photogs. This one shooter was w the Mayor I believe, every shot his flash would rapid fire a ridiculous number of times while he held his hand where a bounce card should be. It was a pretty chill scene except for this guy. Was he actually getting frames that fast or is that some flash technique? Either way it was out of control. These were folks standing still in conversation. Any idea?