I’m gonna guess that they were indeed urban youths, which would mean they are from a culture that practices loud audienceship—from film to theater to dance and music.
One poor dude going after them led to a not very surprising outcome.
Well,it’s a learning experience for the professor...in his heart,he knows.
He forgot to bring his street sweeper.
I remember such things over 55 years ago. Two or three blacks, no problems. add a couple more and no problems. Then another one shows up and they go “Critical Mass” and become loud, Raucous and disturbing everyone around them. this happened often in military chow halls and movie theaters.
Reminds me of the movie theater scene in the movie "The Last Dragon".