Grey had analysed Sebastia a little when he was watching her fight against the vice leaders of Jacks and Nyanmi. To his surprise, Grey noticed similarities between her fighting style and the cultivators that he had encountered in Jin's dungeons.
The style was similar to a Chinese martial art called Wing Chun, which specialised in remaining a fairly stationary position to readily block fast moving blows to vital points. The martial artist achieved this stationary position by only shifting or turning within a stance on the heels and balls of the feet. Grey had encountered one particular cultivator who had fought with the techniques of the Wing Chun in her style.
The Cunning Crane Style.