"Opposite action
This skill is used when you have an unjustified emotion, one that doesn’t belong in the situation at hand. You use it by doing the opposite of your urges in the moment. It is a tool to bring you out of an unwanted or unjustified emotion by replacing it with the emotion that is opposite "https://en.wikipedia.org/wiki/Dialectical_behavior_therapy

So it has to be an unjustified emotion to do the opposite action.