The plamacaster & mask are both linked, either through a wireless connection, or through the wires that protrude from the mask. Which ever direction that the tri-beam laser sight in the mask is facing when is are connected is the direction that the plasmacaster will aim, basically, as long as the pred is wearing it's mask, the plasmacaster is controlled by his head movement. As for it firing, well, inside the mask there are small, mandible-triggered controls to the predator's cloak, plasmacaster, & vision modes, meaning he can activate any of these without using his hands, although there are also secondary/backup controls on the preds left wrist gauntlet in the event of mask loss.