one more example from "sword and the exqusitness"
[Madame Hai Tang continued:"That time I stood away from reverend Tiangang and Hongyun lama for about 30 metres away from them. But I could still feel the force released by reverend Tiangang's techniques, even my clothes sort of swayed with the wind. However I do not sense anything from master Nu's attacks and we're standing quite close to them."
Yu Fanghe smiled:"Master Nu has reached a higher level in internal energy control. He is able to focus his power only on Yu Peiyu not a drop of energy is wasted unnecessarily. When his attack is in vain, he will redraw his energy and use it into a new stance. If not all of us would have been blown outside by the force of his stances. Perhaps even the entire room would collapse."]
master nu's inner power is very 'pure', the more pure your energy is, the more easily it is controlled.