The character is adept at firing from a fixed position.
Any ranged attack the character makes with a Crossbow or Arbalest adds the Splitting Quality with a value equal to twice the number of Aim Actions made before the shot.
Additionally, if they have a tower shield, it can be set up as a Secondary Action and used as cover. While behind the shield, the character can take a single Aim action as a Free Action if they do not move or reload during that Turn.