The same metal. Therefore the same creature.

Cytochrome c oxidase — Complex IV — is the terminal enzyme of aerobic life: the site where electrons finally meet molecular oxygen. Silver ions bind the copper centres, CuA in subunit II and the haem a3-CuB binuclear site in subunit I, displace copper, and freeze the catalytic cycle at both the electron-entry point and the oxygen-reduction step. In a shifted Lycian those enzymes are running at maximum in muscle of extraordinary mitochondrial density. Local inhibition is immediately catastrophic.

Cascade propagation does the rest. The electron-transport chain backs up. Lactate surges. Oxygen-poor, acid blood hits a heart that is itself a shifted, mitochondria-dense organ. Cardiac function degrades metabolically before free silver ions ever arrive — they are scavenged by albumin and metallothionein. The wound becomes a systemic crisis because the engine is systemic. Same metal as the haemophage. Different molecular target. Convergence is evidence, not folklore recycling.