The Knockout Game usually includes a pack of rabid hyenas since they are cowards when they are alone.
Just today near the University of Washington (Seattle) I caught the news of a guy getting a beat-down by three men. No identification of either the victim or the thugs was provided on the news. (90% chance it wasn’t needed either).
In this case it appears that a train provided the knockout slam that would have normally required a feral pack. The coward then slipped away into the crowd.
Have these yoots started shoving pedestrians off the sidewalks and into the paths of trucks, buses, and taxis? Seems like a logical extension of this type of grotesque malevolence.