If trouble presents itself, and you have to act, its really about all you can do, if you want to "solve" the problem. Theres no such thing as fighting defensively.
AK103k, My point is that in civilian self defense having to select a good guy from a bad guy is very unlikely. The threat usually presents itself hence being a threat. If I don't know where the threat is then it is highly likely that I can make a swift retreat.
Police officers on the other hand must approach danger even unknown danger. The chances are much higher that they will in fact have to choose between an innocent and a ruffian in the course of their jobs.
Again I just believe that the OP's time would be better spent on more realistic and likely scenarios.