What is a clean Agile (Scrum) Sprint Presentation?

Question

Suppose someone of your development team is presenting a sprint to the customer but he is having web connection problems such that a complete story cannot be presented. For the sake of the cleanness of the presentation, do you help your colleague suggesting possible solutions and try to fix it in the moment? Or is it kind of messy?

May be the customer (who is "part" of the team) will understand? Why?