In the very beginning of The Man from U.N.C.L.E, we see Napoleon supposedly killing the Red Peril and a rainbow that looks like a lens refraction:
And then in the very end, we see the Red Peril actually killing Alexander Vinciguerra, and again a rainbow, this time looking like an actual rain rainbow:
To me a rainbow is a metaphor for spring, the good, cheerfulness etc. I mean rainbow always stands for something good. Now, except for these two cases I have not noticed the rainbow anywhere else in the movie, thus my question: Is this Guy Ritchie breaking through the fourth wall telling us that these actions were justified? Most importantly what I want to know is how frequent is this technique in cinema?
Edit: I found another rainbow in the movie! This one is so fleeting I missed it the first time: we see another 'refraction rainbow' when Red Peril steals the boat from the satellite factory: