TAMPA, Fla. – To passersby, T.J., a fit 20-something, is running around a red felt carpet about half the size of a basketball court inside a convention centre. In his mind, he’s wearing a full set of body armour, his face obscured by a ski mask with a death’s head silkscreened on it. And he’s just dropped a terrorist inside Osama bin Laden’s Abbotabad compound.