Quickness

How quick are you?
How quick do you need to be?

You do not have to be the quickest that you can be. You only need to be quicker than your current opponent. Quickness is relative.

Reaction time, quickness, and speed are interrelated. Reaction time is how long it takes before you to take action in response to an attack. Quickness is how long it takes for your muscles to start moving once you decide to react. Speed it the velocity of your movement, block,  attack, or counterattack toward the target. All these involve a measure of time.