A Death blow is a Life blow to Some — Germination

A Death blow is a Life blow to Some 1
Who till they died, did not alive become-
Who had they lived, had died but when
They died, Vitality begun.
(F.966/J.816)
[1] Death blow:: a wind blow to separate seeds from some plants. Life blow:: a burst of seeds to start new lives.
[2] died, alive:: from Bible, "Thou fool, that which thou sowest is not quickened, except it die." (1 Corinthians 15:36)
[3] Who had they lived:: the plant had seeds lived. had died:: the plant had died.
[3, 4] but when They died:: but when the seeds died.
[4] Vitality begun:: the power of germination started.