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I agree that Bayern Leverkusen should not be playing so seriously since they have beaten Bayern Munich for this season's Bundesliga title, but since they want to end this season unbeaten, they will be serious with every single match they play in the Bundesliga. Bayern Leverkusen needs to win or draw their last match in the Bundesliga this season to end the league unbeaten, and I believe Augsburg will not be a threat for Bayern Leverkusen.
Leverkusen seriousness against Bochum is because they want to avenge last season's defeat, they made good use of every opportunity to beat Bochum in the same place where they lost last season. Leverkusen are also getting closer to their unbeaten record in one season, they only have one more game left before closing a very brilliant season. Augsburg is Leverkusen's last challenger in the Bundesliga, the last match will also be played at Leverkusen's headquarters, a draw is enough for them to set a record as a team that is unbeaten in one season.