Biblo will talk about Imu and void century flashback begins.

Biblo wants to explain something to Chopper, and the two other flashbacks in this arc happened during an explanation (Loki explaining to Hajrudin and Brook explaing to the strawhats). Imu's flashback will be the same as Biblo will talk about Imu and then Imu's flashback, the void century flashback will begin.