CEP Strategic Advisor Liam Duffy writes: "In other ways, Lee Rigby’s murder was the kind of gruesome spectacle that al-Qaeda’s leadership would later warn against, but which Islamic State would make their hallmark. A gruesome spectacle, but a shoddy and amateurish one, too: Adebolajo and Adebowale rammed Lee Rigby with a Vauxhall Tigra before trying, and failing, to behead their victim. The rusty antique revolver they had acquired malfunctioned, and they were denied martyrdom by arriving armed police."