on Helping Writers become Authors:

After the Midpoint, your story heats up. The Second Half of the Second Act is where your plot really begins popping. Your main characters cap the dramatic event at the Midpoint with a decision that allows them to stop reacting and start acting. Almost always, this is born of a personal revelation, even if the characters can’t yet quite put it into concrete terms.

As of the Midpoint, they’re becoming someone new. They’re realizing their full power and stretching their wings to discover what they can do with that power. Their inner problems are still getting in the way, but they’re realizing they have to do something either about or in spite of them.