Well I have a theory, because the body/mind always tries to survive when strong pain stimulus, threat of pain, or threat of imminent death causes adrenaline surge (or testosterone from treatment related drugs) might make him coherent for longer than normal. The problem with adrenaline is that it's toxic which is why it lasts for such a short time when produced naturally by the body. I think this is why anyone who has dealt with a family member who has Alzheimer, they show brief moments of their old selves but it happens when something cause them to stress and trigger their survival instincts.

Is this bait?

Go back to the past 14 chapters my guy!