Cat Lepiane, 18, said that later in the evening, the crowd was rowdier than usual for dubstep, a genre of electronic dance music. Dubstep concerts, she said, are more about dancing than moshing. But on Saturday, there was "a lot of crowd-surfing, and I saw a bunch of people being pulled out of the crowd," she said. "Everybody was pushing each other, and it's not usually like that."