There are places in the Gospel of Mark where he “gets ahead of himself,” telling us one part of the story and then going back to fill in what we need to understand it.
And example is when he exorcizes the Gerasene demoniac. He writes:
6 And when he saw Jesus from afar, he ran and worshiped him; 7 and crying out with a loud voice, he said, “What have you to do with me, Jesus, Son of the Most High God? I adjure you by God, do not torment me.”
8 For he had said to him, “Come out of the man, you unclean spirit!” [Mark 5:6-9]
Notice how verse 8 provides the explanation for the material before it. Jesus had already begun to perform the exorcism when the demon cried out.
This is a characteristic of Mark’s style, which is a little breathless. He’s so excited to tell the story that he gets a little ahead and sometimes needs to fill the audience in on the back story. (He also uses the word “immediately” constantly, as well as joining many clauses with “and,” and describes past events in the present tense–all of which create a driving sense of forward momentum in the plot.)
Sometime I should try to catalog all of the places where Mark does this.
I first heard about this from actor Frank Runyeon at a performance of his one-man show of the Gospel, titled “Afraid.” I didn’t like it myself, but thought I’d share – http://www.runyeonproductions.com/plays/afraid.html