After Rey withstands Kylos interrogation and pushes back add a quick montage of Kylo using or learning mind trick and/or other abilities.
So that it plays out just like the scene where Harry sees Snapes memories in Order of the Phoenix.
As for the footage for this montage you could use Kylo interrogating Poe. Other than that there is a cut scene from the single player campaign of Battlefront 2, I think.