if (active == 0)
    instance_destroy();
if (active == 1)
{
    if (instance_exists(target))
    {
        shakeamt -= shakereduct;
        on *= -1;
        target.x = nowx + (shakeamt * on);
        if (shakeamt <= 0)
            instance_destroy();
    }
    else
    {
        instance_destroy();
    }
}