Wasn't there a Bourne movie trailer that contained a scene or quotation that never occurred in the movies?
https://www.youtube.com/watch?v=wCxuxrLNrsw
My guess is that it was going to be part of the movie but ended up getting cut for editing reasons. (The whole "hair as weapon" bit is probably inconsistent with character for the rest of the movie)
Doing scenes within a movie and making it feel 100% as a trailer and then cutting it out is different.