Or , in the alternative .... Trevor's sister may have a history of trauma injuries due to her exposure to risk taking . They may be a "need for speed " family ?
If Trevor has the guts to drive 200mph ..... who say's his sister can't/didn't take risks ?
This is where the medical professionals must document - any - trauma.
Had we reached the point where medical investigation for reduced bloodflow , was an accepted procedure.......
That is a grim story of D E. May he RIP.