not enough to know the timing

With blood trailing down from the corner of his mouth, Accelerator was now confident
he knew what was happening.
Kihara Amata would reverse the direction of his punch just before it hit Accelerator. He
would do so in the instant when he was just barely touching the thin protective film of
Accelerator’s reflection. That forced Accelerator to pull the backwards-moving fist
forwards.
This just meant he had to alter the vector control ability protecting his body, but
Kihara’s fist made minute adjustments in the direction of its turn as if the man had
predicted the changes Accelerator would make. It seemed the intellect that had directly
developed the esper power known as Accelerator was quite something.
“What’s wrong, kid!? I thought you came here to save that brat!”
He had lost his timing, had the rhythm of the battle taken from him, and was being led
around by the nose. Each individual blow from Kihara seemed weak, but it gradually
built up in his body like alcohol. As Accelerator’s movements grew duller, Kihara started
taking bolder and bolder actions which only quickened the rate at which Accelerator
grew “drunk”.

- Old Testament Volume 13 Chapter 10 Part 1