The world is blasted, unfamiliar. Smoke swirls amid the gloom. Foul odours belch from the sulphurous earth. The landscape echoes to howls and grunts and screams. A great light has gone out and all that remains is confusion and fear. Everywhere coaches and managers, hunched under their doubts, scuttle hither and thither, desperately seeking a path through the wilderness. From his very first season at Barcelona, Pep Guardiola's way of playing football has been dominant.