Palm jab and upper cut are pretty easy to teach and affective. So is a inside side kick to the knee (knee check). I've had a few bar brawls where, a knee check or a roundhouse to the thigh followed with a 1-2-3 combo, generally renders a knockout/disabled foe and general keeps their buddies from trying the "that's my boy" routine.
That's the ticket, move right through them. I'm not as fast as I used to be, that's why I have Mr 1911.