I think that combat would be made a lot easier.
"What's that, you fiend? You can't possibly be fighting me right now! 'Why,' you ask? Because, you're dead, of course. See, there's your body over there. Oh, that's right, how silly of me! The deceased can't see their own bodies, causes too much trauma and some such. You'd do yourself a favour if you would just lie down quietly and wait for your spirit to be whisked away to the afterlife. I'm told it's quite painless. Good-night, now!"
And, of course, the ever-popular:
"These aren't the 'droids you're looking for." :waves hand: