Going
Conditional syntax
The double 'or' creates uncertainty—which night? Any night? The vagueness suggests death doesn't need special circumstances.
Rocking chair image
The chair keeps rocking after the figure stops—a haunting detail. Empty motion continuing after the person is gone.
Chanticleer
Medieval/literary term for rooster. Dickinson uses high diction for a barnyard bird—typical of her mixing registers.
Past tense shift
Sudden switch from hypothetical future ('would anybody') to completed past ('There was'). The death has already happened.
Knoll
A knoll is a small hill—often where graves are placed. She's describing a child's body as 'plump for every little knoll.'
Feet/goal paradox
Feet 'charged' with preciousness (childhood potential) reach only a 'small goal' (small grave). The economics of early death.