Weyland again asserts control. The colony's pregnant women, children and essential specialists are evacuated to the "Geographic". The grendels cannot hunt far from water, so most others are evacuated to Weyland's mountain camp. Combat is joined. At first, the colonists' technology and tactics serve them well. Weyland observes the grendels' behavior and discovers that packs of grendels can be sent into a shark-like feeding frenzy by spraying them with blood taken from dead grendels, especially if it is laced with the "supercharger" chemical. Tracer bullets are used to ignite the supercharger gland in their bodies.