Here we go with another can of worms!!!! It all depends on whether or not you're gonna put it out with external techniques or Internal ones.
Externally you will develop the ability to snap out short range fast punches I guess in order to create vast wind to blow it out. Internally you shouldn't move an inch or tense your muscles, and you would create the force to put it out internally with Qi. That used to be the test of an Internal Master, an acknowledged act of Yang Lu chan.