As living creatures, humans needed time to think. No matter how quick a person's reaction speed was, their body would still need some time to make a response. Thus, when players at the Extrasensory Realm fought each other, the fight would turn into a competition of speed.
However, that would only be the case for players in the Extrasensory Realm's first stage.
Upon reaching the Unthinking Realm, players would no longer need to rely on their brain's thoughts to carry out actions. Instead, their bodies would move automatically, akin to moving entirely based on instincts. This, in turn, allowed players to execute actions at unbelievable speeds.
Normally, if players wanted to reach the Unthinking Realm, they would need to invest a significant amount of time in harsh training and combat. This was so that they could develop their body's instincts. Hence, players who could reach the Unthinking Realm were typically old monsters of advanced age.
Reaching the Unthinking Realm is one of the requimemts to achieve both the World Tower's Pseudo-Sixth-Floor standard and the Sixth Floor standard.