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Jesus famously said that if someone slaps you on one check, you should offer him the other cheek as well. "Turn the other cheek" has long since become a catch phrase for what Eckhart Tolle and others (like the Buddha even before the Christ) call non-reaction. It's really the only sane response to violence. Anything else will only perpetuate a cycle of violence that will never end until one of the parties is either annihilated or until one of them decides, finally, to employ non-reaction.
The first key to non-reaction is internal. It means that your response isn't a knee-jerk, unconscious response to what's happened or what's about to come your way. It means that your ego doesn't take you over, causing you to act without really realizing what you're doing.