Inside John, she thinks, is another John, who is much nicer. This other John will emerge like a butterfly from a cocoon, a Jack from a box, a pit from a prune, if the first John is only squeezed enough.
In the text, the character believes that within John lies a better version of himself, one that is kind and compassionate. This inner John is envisioned as transformative, waiting to come to light through some form of pressure or challenge. The imagery suggests that, much like a butterfly emerging from a cocoon, this nicer John has the potential to flourish if only given the right circumstances.
This metaphor implies a deep hope for change and renewal, suggesting that personal growth can be triggered by external influences. The other John symbolizes the possibility of redemption and inner goodness, reinforcing the idea that individuals can evolve into their better selves with enough encouragement and support.