The skill he used to dodge Kayneth’s Mystic Code just then wasn’t a basic physical enchantment. It was an advanced magecraft with a greater range of utility – and obviously with far stronger side effects.

The ability to separate the passage of time inside a designated space from the "flow of time" in the outside world; in some ways, Time Manipulation can be regarded as a type of Reality Marble. Although it is classified as a greater magecraft, it is definitely not "magic" which cannot be replicated. Compared to "time modification", which can reverse cause and effect and change the past, this is merely the magecraft of "time adjustment" that can stagnate the time that had passed and accelerate the time in the future. Therefore, it is not a magecraft of extraordinary difficulty.

The only problem one needs to consider is the size of the bounded field and the scope of time that needs to be modified.

Kiritsugu’s root, the Emiya family, spent generations researching and seeking the magecraft that controls time. The magic crests existing on Kiritsugu’s back inherited the fruits of research from generations of men. But the amount of prana one needs to spend and the rituals needed in preparation to activate this kind of magecraft rivals in magnitude with the greater magecrafts. Therefore, it has to be prepared and used strategically. For Kiritsugu, who made up his strategies to just survive on the battlefield, it was originally a rather useless inheritance.

However, to use the "time control" ability he’s inherited at the maximum, Kiritsugu created a flexible way of utilizing this magecraft at a very small scale.

A method that kept the scope of the bounded field within the practitioner’s body made it easier to establish a Reality Marble. Although it is impossible to completely isolate the flesh from the outside world, it can minimize the affect the outside world has on the body. Within this minimal bounded field, he "adjusts" just a few seconds of time; this is the magecraft that Emiya Kiritsugu created, Innate Time Control.

For example, when he fought Kayneth just then, Kiritsugu "sped up" his blood flow, haemoglobin metabolism, and muscle movement all at the same time. All that’s left is to use his quick reaction time to dodge the attack after he easily predicted the track the mercury whips would take. Kiritsugu is capable of accomplishing physical feats impossible for ordinary humans after he accelerated the time inside his body.

The biggest problem for this magecraft is the huge burden on the body.

The craft of time modification inevitably creates errors between the time within and without the bounded field. This error would immediately be corrected by natural forces when the bounded field is removed. That is, the "world’s own adjustment". Of course, this adjustment can only happen where "errors have occurred", which means inside Kiritsugu’s bounded field – his physical body. Adjustments have occurred in his flesh to get back in sync with the normal time flow.

Death is the accompanying danger born from using magecraft, but Innate Time Control is above all Kiritsugu's riskiest technique. Just now, it was as though he was tightrope walking while his flesh was being shredded.

- Fate/Zero: Act 6, Part 4