In SB it is implied our "special echo" is actually gameplay related, the ability to see castbars and aoe markers, as when Fordola is attacked by Lyse and Alisaie and with her copy-echo evades all of their attacks and says she has "seen" them already, making the ability to foresee which attack your opponent will use and where it will land even before they start moving an echo ability, and since we don't really see Arenvald or other characters with the echo using it, it must be an individual ability we have been using since the start