Batman Arkham Origins - Shadow Vigilante rank 8 (read description)

just like how I showed rank 7, follow the same tactic except this time you running (hold X and moving toward enemy's direction - ps3) and slide to knockdown least 2 enemies. larger the group easier it is and fide a big object to gather enemies around like the car in the video. run around the car and they will gather around. Start running towards them and keep sliding, you will eventually hit 2 of the. you don't need an object like the car, you can do this any where.