You know what I see in them? each time they do a quick attack (be that a normal run or a counter) they kinda just go into this "nirvana" of quick passes that really aren't predictable (lots of heel, outside of the foot weird passes) and they are tremendously effective.
Of course, they don't always come out, which you could see gave Madrid some chances and some time on the ball, but 'ell when they got a clinical guy upfront, coupled with pace and sneakiness of Reus and the master-class midfielder that Gündogan is, they move it and they move it nicely!