The aerostories link:
http://www.aerostories.org/~aerobiblio/article2794.html
It is the review of a French book about two young French who stole a Luftwaffe aircraft in occupied France in 1941 and flew to UK. One of them, Jean Hébert, died on 9 June 1943. The other, Philippe Bauduin, is said to have known that his friend was shot down in error by Spitfires. As I have not read the book I can't say anything about this.