In my opinion, yes. If you don't need a firearm so bad that you are ready to kill the person, you probably shouldn't be using one at all, particularly one that is loaded with lethal ammunition in addition to the lethal blanks. [You did know that blanks are lethal under certain circumstances LIKELY to be encountered by someone using them for self-defense, right?]
In addition, loading two kinds of ammo is an invitation to an error in loading, or in closing the cylinder. There is absolutely NO chance you would ever load an S&W the way you'd load a Colt, right?
Use a powerful flashlight and a clear and loud voice to issue a challenge, if that is really what you want to do.