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Zealous created a topic of Profundis

Sorry if I am incompetent, but I need clarification please. Just finished reading and I get that yugeon is traumatized and all that. My confusion is before heesong dies. Yugeon was guiding his brother, the espers attack, shin shields yugeon while he is still with heesong— but then yugeon is latched onto shin and his brother is dead? Like did yugeon make a choice and chose shin or was he somehow moved?