Thread:Owenbretts/@comment-1632909-20150706012439/@comment-1632909-20150706215920

The sentence says "that were seen in the film", which conflicts with the bit about the floor, because it's referring to the steps only. If the sentence were "The dance between Rose and Greg features a similar glowing dance floor that was seen in the film...", it wouldn't make sense. It would need to be "to the one" or something like that, which is why the mdash is needed to separate the thoughts contained in the sentence. Is that clear enough for you?