In the kind of game that makes a person return to old vices after, the loss to Heidenheim has hurt Bayern Munich not only in their Bundesliga hopes (we can call them dreams at this point), but also in their chances against Arsenal in the UEFA Champions League quarter-finals, as morale will inevitably be low.
Here's our talking points from this game:

The inexplicable changing of tactics that worked in previous games.

The individual performances of Serge Gnabry, Leon Goretzka and Dayot Upamecano.

Manager Thomas Tuchel's insistence on certain aspects of play.

Harry Kane's bad day in front of goal.

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