two lapses of judgement that stayed with me because I've seen the same before from these two players
Williams steals, fast break, does not give the ball to a guard and turns it over.
Marving stels, fast break, does not give the ball to a guard and gets an offensive foul which takes him out of the game after he gets the next one.
I think he will learn eventually. He gives that ball to a guard and he probably ends up with a dunk.