Yes, this is quite a big shock for Bayern Munich and also for Vincent Kompany. In fact, Bayern Munich was slaughtered 3 - without a single goal, even though they controlled 80% of the ball possession, this is really crazy. none of their 30 shots became a goal. And on the other side, Feyenoord, with only 8 shots and 3 shots on target, managed to get 3 goals, including the result of a penalty kick.
this is one of the reactions from Kompany as their head coach, yes, he also seemed frustrated with what happened to his squad, he had even implemented the tactic and succeeded, but not with Feyenoord.
Source: ompany after defeat from FeyenoordLosing to feyenood was actually brutal because Bayern Munich was too dominant on the day not to has gotten at least a single goal on that day, but the feyenood team stood their ground and defended as if their lives depends on the final outcome of the game, and one of the major reason the result look flattering to feyenood is that they were very ruthless in front of goal when the chance came begging, since they were actually playing on the counter, and If you pay attention to the statistics of the game, you will be asking how on earth did Bayern Munich lose by such a margin, considering how dominant they were, but nevertheless, just as Vincent company has already said, they weren't able to find solution to the defensive strategy of feyenood, because it wasn't their best days at the office, and truly it was really a shocking scoreline considering how dominant Bayern Munich was on the night, so the best Bayern Munich can do is to move on and work more on how to break down teams that came with a defensive strategy, because they should be expecting more teams playing defensively as feyenood did.