If One Follows the Threads

After witnessing Snape's worst memory and confronting Sirius about it, Harry cannot simply go on as if nothing has changed. A bullied child for most of his life, and with his notorious "saving-people thing" gnawing at his conscience, he does the one thing that follows naturally from who he is: he goes to Snape to apologise — and to tell him that he is not like his father. At all.