Mark seems to have, pardon the term, ADHD. He jumps from story to story, skipping dialogue and getting right to the action. If you look @ this book in a version with each verse on a new line, you will see 'and' and 'immediately' over and over again.
While the others seemed more interested in what Jesus said, this gospel writer was most interested in what Jesus did. And he was excited about it. Are you?

Mark 1:1