Ranged mob not updating it's aim?

public class EntityBoomer extends EntityMob implements IRangedAttackMob {

private EntityAIArrowAttack aiArrowAttack = new EntityAIArrowAttack(this, this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).getAttributeValue(), 20, 60, 15.0F);

public EntityBoomer (World par1World) {

super(par1World);

    float moveSpeed = 0.45F;

    this.tasks.addTask(7, new EntityAIArrowAttack(this, this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).getAttributeValue(), 20, 64.0F));   

        this.tasks.addTask(1, new EntityAISwimming(this));

        this.tasks.addTask(2, new EntityAIRestrictSun(this));

        this.tasks.addTask(5, new EntityAIWander(this, moveSpeed));

        this.tasks.addTask(6, new EntityAIWatchClosest(this, EntityPlayer.class, 8.0F));

        this.tasks.addTask(6, new EntityAILookIdle(this));

        this.targetTasks.addTask(1, new EntityAIHurtByTarget(this, false));

        this.targetTasks.addTask(2, new EntityAINearestAttackableTarget(this, EntityPlayer.class, 0, true));

this.setSize(0.6F, 2.3F);

// TODO Auto-generated constructor stub

}

protected String getLivingSound(){

return "eternisles:BoomerLiving";

}

protected String getDeathSound(){

return "eternisles:BoomerDeath";

}

protected String getHurtSound(){

    return "eternisles:BoomerHit";

}

@Override

    public void onLivingUpdate(){

super.onLivingUpdate();

}

    @Override

    protected void entityInit()

    {

        super.entityInit();

        this.dataWatcher.addObject(16, new Integer(5));

    }

    @Override

public void applyEntityAttributes(){

super.applyEntityAttributes();

this.getEntityAttribute(SharedMonsterAttributes.attackDamage).setBaseValue(6.0D);

this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.5D);

this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(10.0D);

}

@Override

  public boolean isAIEnabled()

    {

        return true;

    }

@Override

public void attackEntityWithRangedAttack(EntityLivingBase var1, float f){

        EntityBoomerBallvar2 = new EntityBoomerBall(this.worldObj, this, 4.0F);

        this.playSound("random.bow", 1.0F, 1.0F / (this.getRNG().nextFloat() * 0.4F + 0.8F));

        this.worldObj.spawnEntityInWorld(var2);

    }

}