The Chinese martial art of Wing Chun specializes in infighting.
The key points of infighting are the control of the enemy's angle of attack, i.e., to control and limit the ways or angles through which an opponent may find an opening in one's guard to counterattack or get past a block or guard.
This is attained by controlling the opponent's attacking limb, transferring momentum and debilitating his stability by forcing his posture/position and shifting his mass on his center line.
Examples include: Secondary elements include the creation of angles of attack and defense by maneuvering the limbs of the opponent, parrying and blocking properly with the necessary movements and posture to gain the upper hand and strike from a safe angle.
Distance in infighting isn't what gives it its name, but instead, it's how to get past the opponent's guard and fight inside of it.