Fulgrim looked around, gesturing for Jaghatai to come closer. Then he whispered into Jaghatai's ear, "Ferrus is sometimes like Perturabo used to be—completely impossible to reason with."
Jaghatai nodded, putting on an expression that said he understood exactly how Fulgrim felt. Having gained his brother's approval, Fulgrim gradually began to open up.
With Fulgrim's further elaboration, Jaghatai gained a deeper understanding of the relationship between Fulgrim and Ferrus.
To put it in a more straightforward and easily understood way, Jaghatai was willing to compare Fulgrim and Ferrus to characters from an animated show he had watched in the Big Canteen.
Ferrus was like a delinquent with a face full of hard, rugged lines and an overbearing way of doing things. Like Jotaro Kujo in Part Three, whenever he hit someone, he only ever made sure they could never get back up.
And Fulgrim? He was the head of the arts club, famous throughout the school—sensitive, understanding, gentle, and self-disciplined. Konrad Curze, who attended a psychiatric school, saw him as the white moonlight of his heart and his salvation.
These two people with utterly incompatible temperaments ended up becoming the closest of friends, and the Emperor's Children and Iron Hands shipped them hard. Space Marines hated whom their Primarchs hated, and loved whom their Primarchs loved. In private, they always found their own ways to define the relationships between the Primarchs with perfect clarity.
Strength and roughness, delicacy and sensitivity—like yin and yang in Tai Chi, they complemented Fulgrim and Ferrus perfectly. Yet in a relationship, it was often the more sensitive party who bore greater pressure. Ferrus did not understand Fulgrim's pursuit of art. This practical-minded engineering nerd disparaged Fulgrim's hobby with some profoundly off-putting remarks. Throughout it all, Fulgrim kept yielding to preserve their relationship, ultimately causing the balance