Labyrinth Of Suffering

When Blaine Anderson went shopping for his hungry friends in the supermarket, he didn't expect for his life to really begin upon meeting what appears to be a mysterious teenager his age. Why was the pale boy with brown unkempt hair taking a bar of soap among many other things including food he could have taken with watchful eyes? What was his story, and why did he just stand there when the boy made an exit without paying for his item.