The situation now was that, after Xin Yun dealt a palm strike, at most his opponent would suffer internal injuries, but it was very difficult for him to cleave his opponent in two, unlike Luo Fu. With his Thousand Feather Greatsword, which was incomparably sharp, one slash could bisect even those whose strength surpassed his, for a dragon's body simply could not withstand such an Explosive Slash. When the body was cleaved in half, no matter how powerful the energy was, it would be of no use.
It's worth mentioning that Luo Fu's Thousand Feather Greatsword was not some feeble one-handed sword, but a massive Great Sword, incredibly broad, with a length exceeding ten meters, almost as tall as Luo Fu's Steel Giant Dragon.