GRAV PULSE

Use this Stratagem in either:
•Your Movement phase, when an ADEPTUS
ASTARTES REPULSOR FIELD unit from your
army Falls Back. Until the end of the turn, that
unit is still eligible to shoot even though it Fell Back.
•Your opponent's Charge phase, when an
ADEPTUS ASTARTES REPULSOR FIELD unit
from your army is selected as a target of a charge.
Until the end of the phase, subtract 2 from charge
rolls made for any unit that declares a charge against
that REPULSOR FIELD unit.