Ever had a million candle power light shown in your face? It might not be the most effective means to stun a BG, but...the effective use of a surefire and then shots following up the use of the light will be highly effective. It will allow you to acquire your target faster, and will throw the BG for a few seconds. It will also allow you to ID your target, if you have a large family and are worried about shooting the wrong person. I would never go around my house without being able to see well. I would rather be shot, then shoot a loved one because I was worried about a BG shooting at my light.
"Where the choice is between only violence and cowardice, I would advise violence."
~ Mohatma Gandhi