When you speak the audience sees you as a leader - as least temporarily. With that leadership comes responsibility.
For the safety of your audience and yourself, check and be familiar with the emergency exits and to where they lead. When things go wrong appear calm and maintain control. Give clear instructions. There is nothing worse than a panic. Similarly be prepared to handle accidents and medical emergencies.
As the presenter you are responsible when things go wrong – especially an emergency. The group has granted you leadership status and expects you to take charge in an emergency.
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Executive Speech Coach, Business presentation tips from George Torok, the Speech Coach for Executives