Why could something like that happen to Bayer Leverkusen in the Europa League final match, because Atalanta, who had also beaten a new team from England, also looked at their opponents quite carefully, especially since Bayer Leverkusen at that time was quite viral because they had never lost to any opponent. So this makes Atalanta's own spirit and pattern of play improve and become better because Atalanta can also get a sense of pride when they succeed in beating Leverkusen in the final match, which is an important match for both teams.
It was all about preparations, Atlanta was well prepared than it was expected of them, Leverkusen didn't look equally prepared as Atlanta was and it was now like an advantage for Atlanta to use and get ahead of Leverkusen because if Leverkusen was prepared well enough, they wouldn't have allowed all that happen to them not in a game as this that they needed the most to crown all their efforts for the season with a greater rewards.
This has served as a lesson for Leverkusen because they thinking it was going to be business as usual but then it turns out that they are now been defeated for the first time because they let their guard down thinking they will be able to still win even with such uninformed pattern.Atalanta having the opportunity for the first time in a very long while decided to make the best of it and it turns out in their favour.
I think both Bayer Leverkusen and Atalanta were all well prepared for the UEFA Europa League competition but one thing I think was certain was that the Italian club was more determined and focused than their German opponents and that was why they won the final the expense of Bayer Leverkusen. Bayer Leverkusen having not lost a single game in all competitions before that final were very relaxed and probably convinced that they were surely going to win the game but unfortunately for them, the Italian team had another plan.
Whenever a team is playing in the final of such important competition, it's a not a god idea to underrate the strength of your opponents because I personally think Bayer Leverkusen underrated Atalanta because of Leverkusen's unbeaten run before the final but were met with an energetic team that fought till the final to make sure Leverkusen doesn't find the back of the net