But he's pushing her toward Naruto.
You are forgetting that Naruto is with her when they are "flashed". I'm talking about the possibility of the genjutsu starting there.
Just a theory: maybe they weren't sent in another world just like RTN. Since we don't know Toneri's powers, maybe he can control minds,characters or something like that, just like Catwho said, he gives to Hinata everything(like becoming more confident) and maybe with that flash, Naruto will have some feelings for her, but not real one. With all this genjutsu he will believe that he loves her....but still my theory is inconsistent, since WHY would Toneri want Naruto to love her....agghh Idk...OR maybe he'll cast Hinata on a genjutsu with that green light he used on her when they captured her
don't mind me .... I don't know what I'm saying !