My Theory on Flash Step/Sonido/Hirenkyaku/Bringer Light
My theory is that these techniques alter the passage of time on the user’s body and slows their perception of such time, as seen where in battles where Flash Step is used, where injuries appear after they are inflicted. In battles where Flash Step is not used, Injuries are instantaneous (Zaraki Fights as evidence). The delay in injury could only be caused by the body’s internal reflexes and reactions being delayed, as well as restrictions on the body appearing “extended”, rather than being forgotten, simply for battles looking cool. I also believe that these techniques accelerate the user’s perception of time and speed by roughly 11 at Master Level, as seen in the second battle between Ichigo and Grimmjow Making 11 seconds (Ichigo’s max mask duration) seem like 121 seconds.