Cain reflects on cutting Abel's throat

Now I have lived a long time
and had not thought to see
something new -- but something flew,
(like starlings flushed from roost
and then the tree is still)
something flew up, a rush
as fast as flame, as irrevocable.
He said just one word --
God -- and it was like
my name. (Ah this
is what God likes --
the blood and flame.)
Your brother's blood
God said, calls out to me from earth --
and with earth and blood
He marked me -- half god,
half man, His at last,
and blushing --