As Azkaellon and Amit duel in the ritual Tempest of Angels, the two favoured sons of Sanguinius learn something about their virtues and their weaknesses, of both themselves and each other. Even during the age of the Horus Heresy, the twin nature of the Blood Angels is beginning to emerge. This story gives a rare glimpse into the mind of the Primarch Sanguinius, and into the fighting styles of his two chosen sons, both warriors who will be pivotal to the Legions future.