Remember a recurring rule of 2 cours anime, which is putting one of the strongest arcs/plot evolutions/revelations in the middle, at the end of the first cour (approx. ep.11-12-13) or right at the beginning of the second cour (approx. ep.14-15-16). If this event is placed in episode 10, then it looks like a set up element for a main arc in the following episodes.
So it would be something with enough relevance to carry a 3-4 episodes arc. In this regard, Kou or Ohana's mother would both seem valid theories. Personally I'd be more inclined towards the Kou theory, as I believe things with Satsuki will be dealt later.
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