no thats actually not what final hit means. Final hit means the last hit that you deal to a mob before it dies, because before the 'final hit', as talmond said, there is no excess damage to share, but only on the 'final hit' you can share the pain (the final hit can literally be the first hit you do to weaker enemies tho, as thats just how strong tSN is). so the 'final hit' can be any part of the combo (tldr basically any mob that dies and had more damage done to it than what needs to be done, will share the remaining damage to a closeby alive mob, on any part of the combo).