Every story has two timelines, the order in which the author chooses to relate the events, and the order in which they happen in time. Even in stories that appear to be chronological, the characters are likely to be affected by events that have occurred much earlier, prior to the opening scene. Often, certain long-past incidents are revealed at key moments in the narrative.
So the author needs to control both timelines. That’s why Beemgee has a narrative/chronology switch.
Read background information on Narrative vs. Chronology here.