"The one thing you will almost always have in a film is people. Human skin runs from pale pinkish yellow to dark brown, all of which are shades of orange. The color that contrasts best with orange is blue. So you turn up the shadows to the teal end and the highlights to the orange."
"Unlike other pairs of complementary colors, fiery orange and cool blue are strongly associated with opposing concepts — fire and ice, land and sea, day and night, invested humanism vs. elegant indifference, good old fashioned explosions vs. futuristic science stuff. It's a trope because it's used on purpose, and it does something. Especially in theater orange and blue are sometimes referred to as amber and teal in this context."
If orange and cool blue both demonstrate subconscious association with opposing concepts then the contrasts between Emily who is fighting to recover a memory against Robert who is desperately trying to drown his away could be tied in with the cinematography, and this demonstrates a difference between the two of them on screen.