faceEntity(target, false/true)

public float[] faceEntity(Entity entityIn, boolean instant) {

        double var4 = entityIn.posX - mc.thePlayer.posX;
        double var8 = entityIn.posZ - mc.thePlayer.posZ;

        EntityLivingBase var14 = (EntityLivingBase) entityIn;
        double var6 = var14.posY + var14.getEyeHeight() * 0.6D - (mc.thePlayer.posY + mc.thePlayer.getEyeHeight());

        double var141 = MathHelper.sqrt_double(var4 * var4 + var8 * var8);
        float var12 = (float) (Math.atan2(var8, var4) * 180.0D / 3.141592653589793D) - 90.0F;
        float var13 = (float) -(Math.atan2(var6, var141) * 180.0D / 3.141592653589793D);

        /** float agr = (float) (new Random().nextInt(35) + 10)/ 10; **/
        float agr = (float) (new Random().nextInt(55) + 10) / 10;
        float add = agr > 0.0F ? agr : 0.2F;

        add *= add;

        float[] rot = { updateRotation(lastYaw, var12, add), updateRotation(lastPitch, var13, 0.7F) };

        return rot;
    }

    private float updateRotation(float jyaw, float aquaPitch, float mcFl) {
        float var4 = MathHelper.wrapAngleTo180_float(aquaPitch - jyaw);
        float tog = var4 + mcFl;
        if (tog < 0.0F) {
            mcFl -= tog / 6.0F;
        } else if (tog > 0.0F) {
            mcFl += tog / 6.0F;
        }
        if (var4 > mcFl) {
            var4 = mcFl;
        }
        if (var4 < -mcFl) {
            var4 = -mcFl;
        }
        return jyaw + var4;
    }