WARNING - Serious story spoiler THEORY! I mean it! Its a good one though
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Spoiler
What if this very human looking 'sacrificial engineer' scene, that presumably takes place at the beginning of the movie during the so called 'beginning of time' sequence, is actually a bluff of Hitchcock proportions...
Imagine if the Dettifoss waterfall scene is actually taking place on a real 'alien' planet (i.e. NOT Earth!) in the distant future when the human race ascend to become the new Gods, the new inter planetary 'engineers'. ("We are the Gods now" - Peter Weyland, 2023)
This Daniel Twiss chap describes his character as a fairly young 'Engineer' - does this mean young as in, his race as a whole have only recently achieved God status?!
Prometheus final scene:
Zoom in on the saucer starship from the beginning of the movie to reveal the Weyland-Yutani logo.
W-Y Planetary Engineering, Building Better Worlds in the year 9595!
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In the year 2525:
In the year 2525
If man is still alive
If woman can survive
They may find
In the year 3535
Ain't gonna need to tell the truth, tell no lies
Everything you think, do, or say
Is in the pill you took today
In the year 4545
Ain't gonna need your teeth, won't need your eyes
You won't find a thing to do
Nobody's gonna look at you
In the year 5555
Your arms are hanging limp at your sides
Your legs not nothing to do
Some machine is doing that for you
In the year 6565
Ain't gonna need no husband, won't need no wife
You'll pick your son, pick your daughter too
From the bottom of a long black tube
In the year 7510
If God's a-comin' he ought to make it by then
Maybe he'll look around himself and say
Guess it's time for the Judgement day
In the year 8510
God's gonna shake his mighty head
He'll either say I'm pleased where man has been
Or tear it down and start again
In the year 9595
I'm kinda wondering if man's gonna be alive
He's taken everything this old earth can give
And he ain't put back nothing
Now it's been 10,000 years
Man has cried a billion tears
For what he never knew
Now man's reign is through
But through the eternal night
The twinkling of starlight
So very far away
Maybe it's only yesterday
Zager & Evans, 1969