Well, one possibility still open:

Show Sasuke sitting in the tree and have him remembering the fight. The whole chat & fight in up until Sasuke leaves in a "flashback". After that Kakashi joins in, tells his story, thinks "is he really ready for chidori?" -> flashback what happened after Sasuke left the scene. After that the 4 sounds and here we are.

Hell, even Sakura telling the fight to Hinata would be possible.

Often applied stylistic device in literature, called "Botenbericht" in german -- no idea about the correct english term.