I’m stuck on a English question and need an explanation.

I heard a Fly buzz – when I died – (591)

BY EMILY DICKINSON

I heard a Fly buzz – when I died –

The Stillness in the Room

Was like the Stillness in the Air –

Between the Heaves of Storm –

The Eyes around – had wrung them dry –

And Breaths were gathering firm

For that last Onset – when the King

Be witnessed – in the Room –

I willed my Keepsakes – Signed away

What portion of me be

Assignable – and then it was

There interposed a Fly –

With Blue – uncertain – stumbling Buzz –

Between the light – and me –

And then the Windows failed – and then

I could not see to see –

read this and finish the questions in the doc.