Marked For Death At the start of the battle, once both armies have set up all their models, including any units with the Infiltrator special rules, a single enemy unit may be chosen by a player that controls any models with this special rule - this unit is considered 'marked for death'. When any models with this special rule controlled by that player are used to make an attack of any kind against the eney unit their controlling player has 'marked for death', all failed To Wound rolls of '1' may be re-rolled.
Precision Strikes (X) If a model with this special rule, or attacking with a weapon with this special rule, rolls equal to or higher than the value in brackets when making a To Hit roll as part of a melee attack, that hit is a ‘Precision Strike’. For example, if a model with the Precision Strikes (4+) special rule rolls a 4 or higher when making a To Hit roll, then that attack is a Precision Strike.
Wounds from Precision Strikes are allocated against a model (or models) of the attacking player’s choice in the target unit, as long as that model is engaged in combat with the attacking model’s unit, rather than following the normal rules for Wound allocation.