Instinctively, Su Zimo wanted to release a killing move of the Mystic Classic of the Twelve Demon Kings of the Great Wilderness, Sanguine Ape Fruit Offering, when he was faced with the punch with a torrential might that resembled an emperor looking down on the world!
This was his combat instinct.
Combat instinct was for someone to make the right call and judgment through muscle memory. Although one might be in a blank state of mind at the moment of an enemy's attack, their bodies can react without thinking!
At many times, it wasn't because someone could not see the attacks of their enemies - it was because it was too late by the time they thought about how to deal with the attack or dodge it.
Their talent in melee combat relied entirely on their instincts!