Speakers at corporate events, especially the motivational types can be very animated. This retired US Navy SEAL presented a talk on discipline, as it relates to business, using many stories, anecdotes and training from his former profession. This guy was right out of Central Casting for a motivational retired Navy Seal!.
Coverage of these types of events should include 2 different kinds of images; Wide shots showing the audience and closeups like this one. Very often we can't use flash, or are just too far. Knowing how to use available light is very important for good results, especially how to use stage lighting for dramatic results. That worked out great in this case.