«وَإِذَا الْمَنِيَّةُ أَنْشَبَتْ أَظْفَارَهَا»
“And when death sinks in its claws.”
Death is pictured as a predator fastening its claws into prey. The predator is never explicitly named, but the attributed claws evoke it.
In the implicit-metaphor analysis, death is the subject being compared, the predator is the unmentioned vehicle, and the claws provide the decisive accompanying feature. The effect is to make the severity and finality of death’s grip perceptible.