This guy is most effective in brutal psychology because his strategy killed Ang Moh children in just in front of their awaiting parents! The parents who picked up children from concerts are THE MOST KIASU KIASI ones, those who pamper their children to enjoy concert but not allowed to mix with bad youth after concert and care very much for children, and he most effectively picked these targets! Huat Ah! He picked those who are the most vulnerable and unable to withstand the losses.