jacobm: However, my question is still unanswered. How is the force of 'natural selection', being that the most dominant/fittest/etc. male gets to reproduce with the desired female, at work in this case?
There are too many variables at work to ensure the fittest male gets to reproduce with the female snake.
jacobm, the words in bold highlight where your problem in understanding lies.
Natural selection is not a force. It is just a term used to refer to the observed trend whereby animals having traits that happen to be advantageous in their environment tend to thrive more in that environment. It is not a force.
There is no force ensuring that only the fittest animals get to reproduce. It is just a fact that the fittest animals will, statistically speaking, tend to thrive more than less fit ones. I'm sure there are many individual instances in nature where fit animals die without reproducing and "weaker" animals reproduce. There are other factors involved in addition to natural selection. You also have sexual selection and genetic drift.