It wasn't often that Rui's plans went wrong. But not even he was omniscient, anything could happen. His plan had been straightforward. He had feinted a swivel to the side using Phantom Step, but that wasn't what he had limited himself to. He had also used Shadow Step in conjugation with the Mind Mask technique to misdirect Squire Dylon's attention to the feint while his own presence was heavily reduced thanks to the Mind Mask technique. Furthermore, he had used the VOID algorithm to predict the moment when he would be in Dylon's far-end peripheral vision where the Shadow Step technique was at its most effective.
Neither technique would have been effective against Squire Dylon individually. But together when used at the perfect moment with the help of the VOID algorithm, he was able to successfully elude Squire Dylon's attention.