As far as C's observation and relationships -- Healthy folks tend to dump A's FAST.
None of this lingering "waiting to see a miracle," nonsense.
Which is probably why Rational Recovery works for the folks who follow that path. They announce -- "ANY of this Crap, and YOU are Gone!" So of course, the A pulls "this crap" (or that crap) and it is Done and Over.
Detachment with a Chainsaw.