Sometimes killing feels really bad, was it legitimate?

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Last night I was playing on an LA server but I'm on east coast, so ~150 ping. I walk my happy ass into an aid station, then hear footsteps. We both exchange hello's, then he blind fires a hallway and continues to where I am and gets me point blank. Sure I saw him and clicked my mouse to fire, but all I heard was the truncated boom of his shotgun, not mine, and then that black screen. Waiting to die, but 10 seconds go by. 20 seconds. Wow maybe he's tying me up and we're gonna be cool. Finally ...