You can cancels actions with thruster pack.. Say for example.. You are in a melee fight against another. And you both need two hits. And whoever manuevers best wins.. Well if you melee then thuster.... The third person camera helps showing where opponent is and the just close in on him and melee again.. While he is still recovering from melee and or turning to aim at you. Cancels can be from reloading throwing nades.. I havent tested that yet but it show cancel just like it cancels from melees.