article_snippet.sent: Here Sportsmail looks at the five things we learned after the two bitter rivals clashed again in Europe.
article_snippet.sent: It was beautiful, crucial.
article_snippet.sent: The amazing atmosphere generated by Atletico's supporters would have been dented by a goal that early.
article_snippet.sent: It was altogether reminiscent of the backbone Atletico relied on last season, with goalkeeper Thibaut Courtois essential in their La Liga triumph and road to the Champions League final.
article_snippet.sent: the pleasure comes with the pain.
article_snippet.sent: History says History's advantage Atletico .
article_snippet.sent: The Argentine coach will be pleased with this result, because now a goalscoring draw at the Santiago Bernabeu next Wednesday will see The Argentine coach team through.
article_snippet.sent: Diego Simeone will feel quietly confident Diego Simeone men can repeat the trick once more.