Auspex

If enemy models with the Infiltrate special rule set up within 4D6" of a model with an Auspex, then that model is allowed to take a 'free' shot at them (or sound the alarm if Sentries are being used). If the model is part of a unit then the whole unit may shoot. These shots are taken before the battle begins and may cause the Infiltrators to fall back. Otherwise, the normal shooting rules apply.