ManhattanTravel.cs

private Vector3 EnemyMovement(Transform closestUnit, Transform enemy) {
    Vector3 enemyToUnit = closestUnit.position - enemy.position;
    int maxManhattanDistancePerMove = 3;
    int xDirection = Math.Sign(enemyToUnit.x);
    int zDirection = Math.Sign(enemyToUnit.z);
    int xSteps = (int) Math.Min(maxManhattanDistancePerMove, Math.Abs(enemyToUnit.x));
    int stepsLeft = maxManhattanDistancePerMove - xSteps;
    int zSteps = (int) Math.Min(stepsLeft, Math.Abs(enemyToUnit.z));
    int dx = xDirection * xSteps;
    int dz = zDirection * zSteps;
    return new Vector3(dx, 0, dz);
}

Surely there’s some mathy way to avoid all the sign and abs business.