He's got what he wanted - notoriety. He'll be the talk of his neighbourhood for a while, an endless source of gossip in his local, 15 minutes of fame etc.
In his malfunctioning brain he'll see himself as a celebrity, the local boy whose face was in all the papers. The cause of his new-found status (ie, that he carried out an act of premeditated and totally unprovoked violence upon an entirely innocent human being) will not bother him one iota. To him it's an achievement. And now that he's done a bit of time he'll see himself as a hard man gangster...and act accordingly.
Sometime in the not too distant future, someone, somewhere is going to give this strange man the biggest fucking pummelling of his life.
