Leonardo Bittencourt was furious at referee Martin Petersen after two Werder players and head coach Ole Werner were sent off towards the end of Friday’s win over Mainz.
Despite playing with 10 men, Borussia Dortmund found themselves 2-0 up under interim coach Mike Tullberg, but ultimately had to settle for a 2-2 draw against Werder Bremen. Elsewhere, Bayern won, while Leverkusen dropped points against RB Leipzig.