Kihara Counter

The Kihara Counter is an unofficial name of the technique designed by Kihara Amata to counter Accelerator's, Academy City's strongest Level 5 Esper, otherwise nearly unbeatable ability.

Reasons for creation
"I know your characteristics, equations, personal reality, everything! I don't call myself your power developer for nothing!"(Kihara Amata to Accelerator in Volume 12)

Being Accelerator's 'mentor', Kihara Amata was able to find a special counter that let's the user bypass the former's otherwise almost impossible to beat 'perfect' defense.

Mechanics
The Kihara Counter is actually a relatively very simple technique for those who have proper self-control over their body, or at very least posses great enough reflexes. It involves withdrawing one's attack a moment before the impact to overcome Redirection, proving that it isn't an unbeatable barrier. An alternative method to master it is to use the battle data of a master of this technique by uploading it to mechanical limbs, thus overcoming any lack of dexterity.

Weakness
"That's right...Since he can't use his power, my counter is also useless."(Kihara Amata in episode 22 of To Aru Majutsu no Index II)

No matter how effective as a measure, Amata himself realized the weak spot of this technique itself: it only works against Redirection, thus becoming an unsignificant trick in normal battle or any battle it that isn't used against the said or similiar (enough) ability.

Kihara Amata
Because of his intricate knowledge of the Accelerator's skills, Amata can bypass Accelerator's Redirection. Amata can hit Accelerator by pulling back his attack right before it is redirected by Accelerator's AIM field, because it simply changes the direction of the vector towards its opposite, as such anything that is coming towards Accelerator will be redirected back in the opposite direction. In this method, Kihara can use his 'Counter' to retract his fist the moment before it makes contact with Accelerator's AIM field, so the Redirection instead pulls it towards Accelerator.

Other characters usage
Several other characters have tried to used this technique, albeit with various success rates, such as:


 * Sugitani: He claimed to be capable of replicating Kihara Amata's technique of drawing back his fist an instant before receiving impact to break through Accelerator's Reflection, though he commented just by observing them he couldn’t perfectly recreate the technique as shown that even though he landed the hit successfully he injured himself in the process.
 * Kuroyoru Umidori: Has numerous mechanical hands in which she uploaded Amata's battle data should she ever to fight Accelerator.

Possible users

 * Kihara Enshuu: Being able to mimic the mind patterns of others, and mainly used her relative Amata's thought patterns, was most likely able to use this technique, albeit this was unmentioned, most likely since Accelerator wasn't in Baggage City in the first place and this technique only works on Redirection.

Trivia

 * Given that Amata never explicitly named this technique by any significant name, referring to it as 'my counter', this is currently the best name given in fandom to refer it until future mention of it.
 * This technique isn't entirely a simple trick considering that the user has to have perfect timing, proven at least twice by Sugitani and Kuroyoru Umidori as neither could (perfectly) use it the same way Amata naturally did.