User blog comment:Varzan Deodinm Beldinm/Have We All Forgotten about that Golem?/@comment-3146930-20141018174413

I think the reason, at least for me anyway, is that the White Trailer is very different from the rest. The Black and Yellow trailers obviously fit well into the show's story and the Red Trailer started out as more of a rough draft for what the show (and Ruby) would eventually be. The White Trailer on the other hand is between rough and final draft, with the concepts being there but when the show aired, some things were changed.

Now on to the original point, there is some evidence in the trailer to make us believe that Weiss is either dreaming or the fight is a metaphor for some kind of event or problem; meaning it isn't real. As a result, nothing in the trailer can really be taken as fact and because if this, the knight Weiss is fighting simply may not exist. As a result, the trailer and everything in it (including the knight) can't be taken seriously.