Counter-terrorism expert Greg Barton discusses warning signs of terrorist radicalisation following a shooting incident at Bondi Beach. Barton explains that radicalised individuals often exhibit three key behavioural changes: forming new social circles while breaking off old friendships, expressing increasingly extreme views, and acting in transgressive ways that are out of character. The discussion includes details about one gunman's previous connection to an Islamic State terror cell discovered in 2019, when he was 17 years old and involved with extremist groups but could not be charged.