This action is an example of affect display or kinesics.
Explanation:
Affect display is an example of non verbal communication in which <u>someone does some gesture from their body or face that betrays their emotional state or what they are thinking.</u>
It is evident in the passage that the batter is
nervous
eager to outplay the pitcher
The biting of the nail while watching the pitcher closely is a telltale sign of this.
This excerpt shows that while Martin Luther King Jr and Gandhi are two of the most widely known civil protesters they are not the first nor the most important.
