He writes more like a journalist than a historian. He cuts to the quick, introducing Jesus to people who have perhaps heard of him but don't know him very well yet. Verbs like 'run', 'shout' and 'amaze' abound in this book. Mark does not delay the action by telling us about Jesus' genealogy, or even his birth. Then the action begins, and continues nonstop for 16 chapters.
Event quickly follows event.
On occasion, one story is interrupted to begin another, and the first story finished later. Mark's account of the events leading up to Jesus' trial and crucifixion is especially detailed and vivid. But Mark also warns his audience that miracles could be ambiguous. The point was, nobody in the human realm fully understands this truth. The only human acknowledgment that Jesus is the Son of God, comes from a centurion looking at Jesus on the cross.