Ah, thank you for explaining.
I always thought the intention with the garggled out "No" was that the vision was fading, or the connection with the netherworld was a bit weak due to peak times or something. Or that it was a really tormented and painfilled "no" as Qui-Gon is experiencing Anakin giving in to the darkside.
It was obvious the line was recycled, but I felt it was one of the better moments (or to be frank, one of the only decent moments) in the whole film.