Titanic Strides
Codex: Tyranids, p. 66
The unit may Retreat in the Movement Phase and still shoot and charge in the Shooting and Charge Phases at full Ballistic Skill (BS). This unit counts as being engaged if enemy units are within 3" of any of its legs. Units directly under it do not count as being engaged unless the controlling player of this unit wishes them to be. This unit may move over enemy units during the Movement Phase.