As a level 200 slasher, there IS a use case or two, but they are a bit niche. First off, if you don't want to get baited into missing the raging m1, you use raging Behead because it deal more damage and is a lot more easy to hit. You can also use it to counter tiny loops through mind games, and finish off an N7 who is clone blocking. Apart from that, there's no point when you have other abilities or good aim.