The performance of Bayer Leverkusen against Bayern Munich wasn't bad and despite Bayern Munich dominating the game more but Leverkusen still performed well and took their opportunity to score the first goal. Bayern Munich is currently in a better form than Bayer Leverkusen this season but Xabi Alonso was smart to have advised his team to defend when the opponent equalized the goal which is a good decision, Bayer Leverkusen is doing bad and I believe they will keep getting better as times goes on.
Xabi Alonso did not instruct his players to play more openly and instead they tended to defend more, but even so Leverkusen managed to open the scoring through Anderich but not long after Bayern Munich equalized again through Pavlovic. From what I saw the match should not have ended in a draw when Leverkusen did not defend totally because they could have scored a second goal. Defending totally made Bayern Munich more in control of the game so they could dominate.
Bayern Munich continued to attack but the finishing was still not good enough so that no additional goals were scored. Leverkusen's defense and midfield looked solid so they managed to ward off every attack that Bayern Munich tried to build.