my son may have totaled his car tonight

I am glad your son was not hurt. But I'll bet for those few minutes before you got to him were scary. Probably shook him up something good. I travel a lot through the interstates and highways of Nevada, Utah, Idaho and Montana and see deer 'remains' just strewn all over the highway. Now I know why those semi truck have those big cow catchers on the front.
I have never seen a 'deer in the headlights' just stand there. They always seem to jump out in front of you.