I don't think Philip understands the free will argument. His answer to the "middle way" between a choice being determined by prior causes vs a choice being totally random isn't really a third way at all. He says that it's making a choice based on reasons, positing the hypothetical of whether he should take a job in the US. This hypothetical is obviously based on prior causes. It is due to prior causes that he lives in the UK. His choice of job would be determined by the prior events of his life that lead him to considering that job at all. And on and on. So just based on this 5 min monologue I don't think he understands the argument or the concept of it.