The part 2 episode of the Karura arc. Juxtaposing the preview and my knowledge of the events that transpired from episode 18, the following is likely to happen:
My opinion of this Karura arc is that it is in the intention of developing a sub-character's storyline. Since it offers nothing to the MAIN main characters, it is my belief that this leg could have been avoided altogether. But since everybody has already had their share of emphasis, I suppose this could be done. And no way can this be resolved in a single episode.
However, this is a fairly quick judgement, since we haven't seen the episode yet. For all we know, Hakuoro gets strange visions like he did towards the end of episode 4. And if those visions get elaborated, then I'd say this would be a lot more meaningful of a sub-plot.