Dickinson builds the poem on a counterintuitive principle: maximum display equals maximum injury. The wounded deer doesn't limp—it leaps highest. The struck rock doesn't crack quietly—it gushes. The trampled steel doesn't stay bent—it springs back. Each image shows violent energy at the moment of damage, not recovery.
The poem's central trick is in line 3: "ecstasy of death." This isn't metaphor—it's physiology. Mortally wounded animals do leap higher in their final moments, a neurological response to catastrophic injury. Dickinson heard this from hunters ("I've heard") and uses it as her governing principle: the most dramatic display signals terminal harm, not vitality.
The Biblical reference ("smitten rock") matters because Moses struck the rock in anger, and God punished him for it. The water that gushes out isn't a miracle of abundance—it's the consequence of violence. Similarly, "trampled steel that springs" refers to tempered metal that appears to recover when stepped on, but the stress remains in the material. Dickinson is cataloging things that look resilient but are actually damaged.
The final stanza makes the strategy explicit: "Mirth is the mail of anguish." Mail = chain armor, a deliberate defensive covering. The military metaphor reveals that cheerfulness isn't spontaneous—it's tactical. The goal ("Lest anybody spy the blood") is to prevent the social exposure of being identified as hurt. The exclamation mark on "You're hurt!" shows what's being avoided: not sympathy, but the vulnerability of being seen.