SKILLED RIDERS

Space Marine riders and pilots rely on their post-human reflexes to weave around incoming.fire.
Use this Stratagem in your opponent's Shooting
phase, when an ADEPTUS ASTARTES BIKER,
LAND SPEEDER or STORM SPEEDER unit
from your army that Advanced is selected as the
target of a ranged attack. Until the end of the
phase, each time an attack is made against that unit, subtract l from that attack's hit roll.