It's my understanding that after something like that, the character would have trouble readjusting to normal life. I was able to find basic descriptions of what kind of difficulties the character would have (although more information would still be welcome). However, I couldn't find any information about what the best response is. The character has a best friend who, long story short, spent a couple of years as an unwilling guinea pig and so would probably know what to do from personal experience. If the best friend were to do the best thing possible, what would that best thing be? Is there anything that can be done to help or would it be better to leave him alone?
I Googled the following terms, all without quotes:
Post Incarceration Syndrome
Post-Incarceration Syndrome treatment (I also looked at the scholarly articles Google suggested for this one)
Dr. Ewen Cameron
Additionally, I thought remembered seeing some relevant writing from Amanda Baggs, so I looked through the relevant tags (abuse, abuse of power, institutions, communication, power) on her blog, but didn't find it, so I looked through her posts on WrongPlanet. I did find the post (and several other threads that were somewhat helpful), but it turned out not to actually answer my question.