Just one of those random attacks. No pattern at all.
FWIW, this is one factor keeping people from returning to mass transit in the NYC metro area. The mayor and governor are encouraging people to use trains again because many returning to work are using cars; nobody is going to get on a train if they fear a violent Simba will “Mau-Mau” them without consequences.
This is why the NYC area is so segregated; nobody has misconceptions about the race war (it has been ongoing for over half a century now).