from a distance it might seem these striper boats are crowding in on one particular boat, and sometimes this is actually the case. but often times these guys are very coordinated in their attack and will quickly "phone-a-friend" when they find the school and start hitting them. especially if it is multiple boats booked for the same group.
but sometimes it's exactly what you thought it was...people saw a boat net a fish and just lost their common sense and all courtesy