Death Frenzy

WHEN: Fight phase, just after an enemy
unit has selected its targets.
TARGET: One Tyranids unit from your
army that was selected as the target of
one or more of the attacking unit’s attacks.
EFFECT: Until end of phase, if the targeted
unit has not fought, roll one D6
for each destroyed model: for each 4+ that
model can fight after the attacking unit,
and is then removed from play.