I think you will find the answer at the bottom of pg 73 (the big
fight), unless i misunderstood your question.
In the example christine's character choses to augment another hero
as her first action in the contest. She then gets starting APs based
on the ability she uses to augment.
As i understand it, her fate depends on her current APs at the end
of the contest, not on what happens to the character she augmented.
Hope this helps.
cheers,
rémi