No Escape

When: Your Opponent's Movement phase, when
an enemy unit attempts to fall back
(excluding Vehicles and Monsters)
Target: One Adeptus Astartes unit that is
currently engaged with that enemy unit.
Effect: Roll 1 D6, adding 1 if the Accept Any
Challenge, No Matter the Odds vou is active.
On a 4+, that enemy unit cannot fall back this
phase and must remain stationary. Otherwise,
that enemy can fall back, but if it does, all models
must take a Desperate Escape test.