Hello everyone, I've been lurking for some time but this is my first post here 
I've been re-reading the Conviction arc recently and I was wondering, how did the Beherit apostle gain his apostle form and powers? When he explains his backstory he talks about how he met the God Hand at the bottom of the hole he was hiding/being buried in, and that they said that in exchange for "something" they would grant his wish, so he chooses to sacrifice "the world that surrounds him" to "hatch the perfect world".
What confuses me is that this sacrifice is for Femto's incarnation, but the Beherit apostle had already gained his own apostle form before the actual sacrifice took place. How does this fit into what we know about how sacrificial ceremonies work? (evil pouring through a fissure in your heart and all that, as Conrad put it) Is it possible for a would-be apostle to gain powers just by promising to make a sacrifice at a later time?

I've been re-reading the Conviction arc recently and I was wondering, how did the Beherit apostle gain his apostle form and powers? When he explains his backstory he talks about how he met the God Hand at the bottom of the hole he was hiding/being buried in, and that they said that in exchange for "something" they would grant his wish, so he chooses to sacrifice "the world that surrounds him" to "hatch the perfect world".
What confuses me is that this sacrifice is for Femto's incarnation, but the Beherit apostle had already gained his own apostle form before the actual sacrifice took place. How does this fit into what we know about how sacrificial ceremonies work? (evil pouring through a fissure in your heart and all that, as Conrad put it) Is it possible for a would-be apostle to gain powers just by promising to make a sacrifice at a later time?