Rise of the Tomb Raider Ending (Salt Edition)

What if Jacob kept his patience and didn't kill the Trinity soldier running into the Chamber of Souls as this posed no threat to Lara? What if the Source's destruction didn't have to mean that Jacob would die, what if his body just continued from the point where the Divine Source had left him trapped in? (Or, how things should have gone.) ROTR-AU. One-Shot.