They've just found it hard to break Arsenal down with their 11 men behind the ball tactic.
Arsenal haven't got at them once in the second half really.
Yet the score is...?
Football is about pragmatism. Flashy, predictable stuff can be nullified by smart game management.
Arsenal allowed them to play 30 yards out and dared them to break them down - they couldn't, played on the counter, used Walcott's pace better than Bayern ever used Lewandowski, and as a result the team who executed their game plan the best is in the lead.