I replied but obviously didn't post properly (I was just about to take Little Yyke to school so was in a hurry!).

Police brutality! Because Will is Scottish they couldn't understand a word he was saying and because he is Scottish they assumed he was hurling a string of obscenities at them. Consequently, he suffered a slight "accident" which left him with another scar on which ever part of his body you fancy (or will fancy when it has an improving scar) and possibly a really manly black eye.