Desperate for redemption

Use this Stratagem in the Fight phase when a
SISTERS REPENTIA unit from your army is
targeted by a melee attack. Until the end of the
phase, each time a model in this unit is destroyed
by a melee attack, if that model has not fought
this phase, do not remove it from play. The
destroyed model can fight after the attacking
model’s unit has finished making attacks. After
doing so, any other rules that affect this model
'when it is destroyed' are triggered (if any), and
then the model is rem