Alyssa had not really seen an actual 'authentic' duel except for the ones that she had seen in their DADA class, but she guessed a possible reason as to why one would be observing one. So she raised her hand and answered.

"I believe that people would be observing because either they want to see who wins. But more because they want to study either person's style of fighting. What are their defensive moves...you know just in case they might want to duel the person themselves."