About the meaning of 'index' in CIR

Actually, my basic doubt is the following: in NLOS scenario with important range errors, when I extract CIR, the reported first path is the “real” first path (the one that I would have in LOS case) or the one that is considered wrongly as first path by the chip and that leads to ranging error?
If the second option is true (it seems the most logical one), how can be considered realiable all the metrics described in APS006 part3? Why the wrong detected first path can’t be also peak path? Theorically, wrong first path should be the path which has suffered less enviromental reflections and so the one with the biggest amplitude.
I really can’t get an explanation.
Thanks,
Alessio