The advantages of properly executed spells and martial skills are endless, and take invisibility as an example. Invisibility for other dragons is a gradual process, where their bodies slowly fade and dematerialize before disappearing completely after three seconds. However, Xin Yun's invisibility happens in an instant, vanishing with no need for waiting and not a hint of delay.
Take, for instance, Xin Yun's ability to disperse and reunite. If it needed a three-second delay, what use would it be? If an attack is already upon you and you're still not ready, then it's as good as useless.
But now, if someone swung a blade at Yinglong's neck, Xin Yun could instantly complete the Separation Technique, detaching head from body, and then as the blade passed, he could instantly perform the Combination Technique to reunite them. Only in this way would it be effective.
