As always . The real LPT is in the comments . <| sep |> Yes . You can left trigger in to Aim , and then snipe across the boss area from left to right as needed . If you ' re firing from fat away , make sure you lead the servitor a little , and watch for an initial bit of damage from the charging round impacting the servitor . For me last night , it was around 7 , 000 damage . Keep holding the trigger in for a mental count to three , release . and pop . There ' s a few missions in RoI that let you use cannons . find them , practice sniping with it . Either pick out an enemy , or pick out a far away target . then try to hit it while first just standing and sniping , then while moving slowly to practice being under fire from Aksis . Good Luck ! !