to re-emerge elsewhere. In addition, protesters adopted black bloc tactics to protect their identities. Frontliners' "full gear" consisted of umbrellas, face masks, hard hats and respirators to shield themselves from projectiles and teargas. Furthermore, protesters used laser pointers to distract police officers and interfere with the operation of their cameras. At protest scenes, protesters used hand gestures for nonverbal communication, and supplies were delivered via human chains. Different protesters adopted different roles. Some were "scouts" who shared real-time updates whenever they spotted the police, A mobile app was developed to allow crowdsourcing the location of police. Starting in August 2019, radical protesters escalated the controversial use of violence and intimidation. They dug up paving bricks and threw them at police; others used petrol bombs, corrosive liquid and other projectiles against police. As a result of clashes, there were multiple reports of police injuries and the assault of officers throughout the protests. One officer was slashed in the neck with a box cutter, and a media liaison officer was shot in the leg with an arrow during the PolyU siege. Protesters also directed violence towards undercover officers suspected to be agents provocateurs. Several individuals were arrested for illegal possession of firearms or making homemade explosives. Unlike other civil unrests, little random smashing and looting were observed, as protesters vandalised targets they believed embodied injustice. Corporations that protesters accused of being pro-Beijing and mainland Chinese companies were also vandalised, subject to arson or spray-painted. Protesters also directed violence at symbols of the government by vandalising government and pro-Beijing lawmakers' offices, and defacing symbols representing China. The MTR Corporation became a target of vandalism after protesters had accused the railway operator of kowtowing to pressure by Chinese media by closing several stations and not releasing the CCTV footage from the 2019 Prince Edward station incident amid fears that police may have beaten someone to death. Protesters also disrupted traffic by setting up roadblocks, damaging traffic lights, deflating the tires of buses, and throwing objects onto railway tracks. Protesters occasionally intimidated and assaulted mainlanders. Some radical protesters promoted the idea of "mutual destruction" or "phoenixism", these terms being translations of the Cantonese lam chau. They theorised that sanctions against the ruling CCP and the loss of Hong Kong's international finance centre and special trade status (caused by China's interference of the one-country, two systems principle) would destabilise mainland China's economy, and therefore, undermine the