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Blood Warriors' ability reads "If a model from this unit is slain in the combat phase, you can make a pile in and then attack with the model before you remove it."

Does this mean:
A. You may make a pile in and attack if you haven't already done so.
B. You may make an additional pile in and attack.

seeing how it doesn't say it only happens when you haven't attacked, I would say B

Both A and B, if the unit hasn't attacked yet then it will be the model's first one, if the unit has already attacked then it will be the model's second one.