A visual medium

Personally, I prefer that the narration would interrupt the visual story. Even though the verbal language of the narrators is inevitable in a visual storytelling, the way of narrator's depicting what's happening in the story should interfere the understanding of audiences. This is because the producer or narrator pick the idea which they want to say to audiences in one of the various happening in the one story. So they are likely to pursuit the idea and might force audiences to follow it. Therefore, when the story is written or heard, there should be minimum interfere.