User blog comment:HambleBee/Random Pocket Guide for random stuff (Skyrim)/@comment-25075055-20140303120204

Another pointer: the sound of the Unrelenting Force is different for each version. The SFX of UF used by the Dragonborn is a full version and if a similar sound is used by Draugr, you will be thrown back: however, if it just sounds like a fresh wind sound, then it will only stagger.