I heard was only me scene, and makes sense Sean only filmed one afternoon, and that the scene may be like the SF scene in 512, in that case is just a dream, which actually LANa hinted about, their beautiful dream, or can also be a dream Regina has of what would be her life if Robin didn’t died.
But, since Robin doesn’t come to life I doubt will be all fans hoped for, we also have to see that actors are paid to PR the show, so they have to make it sound like will be more than actually is, is not like they can say, oh ,will be a small scene, with no importance to the story.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".