Young Philip has been described by many as being exceptionally mature and well-spoken for his age.
A child with a strong sense of self who has the ability to say 'no' to something they know is wrong, sensing when a stranger doesn't have their best interest in mind...
I could totally imagine an old-soul 10-year old child or precocious child younger than that speaking to an adult stranger that way. A secure, self-confident child could stick up for themselves like that, or it could also be a symptom of the concussion.
AS' comment saying he was scheduled to return to school on Wednesday and that she hoped it would be different this time. I don't know what she meant it to be different from, but maybe he was having some concussion-related issues? Anger and temper can be symptoms and he certainly sounded angry to me.
http://www.cdc.gov/concussion/pdf/Facts_about_Concussion_TBI-a.pdf
I think that one or both of the daughter's had concussion problems, so it could be in reference to that (although, I don't know if Philip had previous concussions).
Refers to some of the previous concussions in the family in this article: http://www.washingtonpost.com/local...5e5e24-0545-11e5-bc72-f3e16bf50bb6_story.html