The name comes from the method of learning the technique, which eventually trains the user's hand speed such that one can snatch chestnuts from a fire without burning themselves. Because Ranma was affected by the Full-body Cat Tongue pressure point at the time, he could not handle the heat from close proximity to the fire. Thus, he did not master the technique in the conventional manner. Instead, he did so by pulling piranhas from a fish tank using his bare hands. In the manga, this is not treated as a special attack, but as a general speed exercise/enhancement. It is mentioned that due to undergoing it, Ranma can throw several hundred punches so swiftly that it looks like a single strike. In the anime it is shouted out loud, and manifestly used more frequently.