What is the major difference between the Second Act in a negative character arc and the Second Act in a positive character arc?
The Second Act is the beating heart of your story - and that's just as true in a flat character arc as it is in a change arc.
The Second Half of the Second Act is where you cue the hero music in character arcs. But this story ain't over, not by a long shot.
Your protagonist's personal revelations are going to lead him up to a very special turning point at the story's Midpoint.
In the structure of character arcs, the First Half of the Second Act is where your character ventures (or is thrust) into uncharted territory - and gets lost.
The second half of the second act is where your plot really starts popping.
This centerpiece is your second major plot point, the midpoint, which divides your second act.