Best way to start a combo (in my opinion) is to aim for their center, their diaphragm if it's open. Hitting that hard will cause them to be dazed and paralyzed with you free to do whatever you want until they can recover.
Next
I wouldn't use this technique much in a serious fight honestly as it's contradicting in it's own description of it's usage.
"can effectively be confused with clones"
"not being easily confused with clones"
Been using swift for nearly 4 years, doesn't make any sense.
Buuut it is useful for finding openings and buying time for your next attack as you move around the opponent.
It's kind of cool tho, reminds me of haku's ice mirrors, only on the ground surrounding the opponent and after images instead of mirrors.
To get technical tho
You have to move much faster than 200 mph to be faster than the human eyes. But can you move fast enough so that the eye won't perceive you? is the question as that's how after images are created. You don't have to move faster than the speed of light to achieve this - only fast enough so that you're moving faster than the eye's response time.
So, lets say you are staring straight ahead, and a 0.25 meter wide person runs past. If they can move that 0.25 meter in 1 millisec, then they will effectively be "invisible". Or about 250 m/s. Then, by the time your eye catches up, the person has moved aready, so there is no overlap.
and
1 mile = 1609.344 meters
1 hour = 3600 seconds
First we find out how many meters per hour:
(250 meters / 1 second) * (3600 seconds / 3600 seconds)
900,000 meters seconds / 3600 seconds^2
900,000 meters / 3600 seconds
900,000 meters / 1 hour
Convert our total meters into miles:
900,000 meters * (1 mile / 1609.344 meters) = 559.235 miles
Therefore 250 meters/sec = 559.235 miles/hour
so if something moved at 559.235 miles/hour, or faster, it would be faster than your eye can perceive unless they saw it coming to or from, like a vehicle on a road or in the air.
(Hayaton: Oni no Mohō Suru) Swift Release: Demons Mimicry
Type: Supplementary
Rank: B-Rank
Range: Short-Mid
Chakra: 20
Damage: N/A
Description:
The user will do the Boar handseal and disappear in a flash of speed. As he moves around the target, his immense speed creates afterimages that can effectively be confused with clones. The user needs to move in a circular or spherical pattern around the enemy to produce the effect. The afterimages will all mirror the movement of eachother which is the movement the user is doing himself. A very useful distraction, the technique can produce up to 9 copies of the user and unless the user has a doujutsu or a sensory ability, he won't be able to tell the difference between each afterimage. Although perfectly visible, the images flicker slightly and are to some extent translucent, not being easily confused with clones. While the target is distracted the user can attack with weapons or taijutsu. Although the enemy will see the user moving to attack, he won't be able to notice which afterimage is going to attack.
What this technique is, is charging your body with swift chakra, running around opponent creating after images, and then striking as you use the images to confuse the opponent. like using taijutsu and genjutsu in unison.