'follower' for attached object ('follower' is the 1st child)

//Object must be attached to center-attachment-point with zero vector/rotation offset.

integer iChildprim = 2; //linknumber of childprim
float fTimer = 0.618; //timer-interval
float fMinDistance = 0.2; //distance the avatar must walk/run.. before it is determined a position-change
vector vLastPos; //stores last known position of the avatar
vector vRelativeChildPos_BeforeAvatarmovement; //stores last known position of the childprim
float fFallBehind = 0.25; //percentage of 'fall behind' of the childprim, while the avatar is moving
integer iMOVING = FALSE;
default
{
    state_entry()
    {
        //initial child pos
        vLastPos = llGetPos(); //avatar position
        llSetTimerEvent(fTimer);
    }
    on_rez(integer start_param)
    {
        llResetScript();
    }
    timer()
    {
        if (llGetAttached() == 0)
        { //not attached, return.
            return;
        }
        vector vPos = llGetPos(); //avatar position
        vector vChildPos = llList2Vector(llGetLinkPrimitiveParams(iChildprim, [PRIM_POS_LOCAL]),0); //childprim-position
        vector vAbsoluteChildPos = vPos+(vChildPos*llGetRot()); //get absolute position of the childprim in the sim
        vector vAbsolutePos = vAbsoluteChildPos + ((vAbsoluteChildPos-vPos)*fFallBehind); //apply offset
        vector vRelativeChildPos = (vAbsolutePos-vPos)/llGetRot(); //get relative position of the childprim in the sim
        float fDistance = llVecDist(vPos, vLastPos);
        if (fDistance >= fMinDistance && !iMOVING)
        { //avatar moving (was not moving before)
            iMOVING = TRUE;
            llSetLinkPrimitiveParamsFast(iChildprim,[PRIM_POS_LOCAL,vRelativeChildPos]);
            vRelativeChildPos_BeforeAvatarmovement = vChildPos; //preserve relative pos of childprim.
        }
        else
        {
            if (iMOVING)
            {
                if (fDistance < fMinDistance)
                { //avatar stopped moving
                    iMOVING = FALSE;
                    //reset pos
                    llSetLinkPrimitiveParamsFast(iChildprim,

[PRIM_POS_LOCAL,vRelativeChildPos_BeforeAvatarmovement]);
                } //else still moving, keep current relative position
            } //else avatar not moving and not stopping, do nothing.
        }
        vLastPos = vPos;
    }
}