Ghastly. If I am not mistaken, this will be the worst mass murder ever perpetrated by an individual with firearms. You can see in the pictures that it is a small island. The young people were trapped and the soul-dead monster hunted them down as they tried to flee or hide.
I know how most of you feel about vigilante justice and due process, but it would have been a mercy to all concerned if the perpetrator had been summarily killed right on the spot.