A key event in The Prestige involves magician Borden precipitating the death of his colleague's wife Julia by incorrectly tying a knot during an elaborate magic trick.
Just before and/or while tying the knot, Borden and Julia, who are face-to-face, exchange strange glances with one another. Moments later, the knot has failed and Julia is dead.
Later in the movie, we learn that Borden is actually two people - twin brothers who alternated as the knot-tier in the magic trick. We also learn that the Borden twins will seemingly do anything to keep their twin-hood a secret (including refusing to tell their deeply loved significant others, leading to one's suicide and another's departure).
My question: given the strange looks exchanged between one of the Bordens and Julia, immediately before the knot failure that led to her death, is it correct to conclude that Julia had figured out that there were two Bordens, leading (one of or both of) them to kill her purposely?