Here's the first ending for this Delta Blues riff. It's a typical melodic downward motion from the tonic chord (E) to its dominant chord (B7). The walkdown also breaks the pattern of the synchronized low E pedal up to this point. The low E now separated rhythmically from the upper structure by falling on the quarter note down beats while the upper melodic line accentuates the upbeats.More videos at https://www.honoluluguitarlessons.net/media