That reaction to a balloon pop was STARK. Clearly, everyone thought it was a gunshot, and if one person freaks out, then it will cause everyone else to freak out as well. Nobody is necessarily to blame, but I think that a combination of two things led to this reaction
Stress and anxiety as we approach finals week and the end of the semester. Nerves are high, students are overworked and overwhelmed. lack of sleep, lack of mental health resources, etc.
Fear of Gun violence in America. (valid fear, unfortunately)
If today's incident really startled you, take time to rest and let your nervous system calm back down. Get rest, don't prioritize studying over taking care of yourself mentally. I know with everything that happened last week, people are probably verrrry on edge, so please do take care of yourself and check in on your friends. Best of luck with finals, everyone. We are almost to the end of the semester.