One frame too late

action act_plane_proptrail()
{
    var last_speed;
    
    set(me, PASSABLE);
    ent_scale(me, 0.03);
    vec_set(my.pan, vector(0.01, 0.01, 0.01));
    
    while(ent_player[MY_CLIENTID] == NULL)
    {
        wait(1);
    }
    
    you = ent_player[MY_CLIENTID];
    
    while(ent_player[MY_CLIENTID] != NULL)
    {
        vec_for_vertex(my.x, you, 34);
        vec_set(my.pan, vector(you.pan, you.tilt, my.roll));
        
        if(last_speed > 5 && you.speed <= 5)
        {
            reset(me, TRANSLUCENT);
            my.alpha = 100;
            ent_scale(me, 0.03);
            ent_morph(me, "propeller_ruhig.bmp");
        }
        if(you.speed <= 5)
        {
            my.roll += you.speed * plane_propellerRotationScale * time_step;
        }
        else
        {
            if(last_speed <= 5 && you.speed > 5)
            {
                set(me, TRANSLUCENT);
                my.alpha = 100;
                ent_scale(me, 0.055);
                ent_morph(me, "propeller_lauf.tga");
            }
        }
        if(you.speed > 5)
        {
            my.roll += you.speed * 0.01 * plane_propellerRotationScale * time_step;
        }
        
        last_speed = you.speed;
        
        wait(1);
    }
}