I believe without that own goal, Roma can block Leverkusen attacks like they did last season but what happened is a big gift for Leverkusen. This own goal of Mancini opens the match for Leverkusen because after that, Roma have nothing to lose more. If the result remains, they will fail in aggregated result and they have to attack to find a third goal. With big space from Roma, Leverkusen have many opportunities to equalize the match and they wasted some chances before scoring a very late goal to make their come back more dramatic.
The first half of this game was a disaster for both bettors and leverkusen themselves but leverkusen proved to be more superior than Roma, that match has noted a bad record for Roma, defeating a team by 2:0 in such an important match and later allowing them to penetrate to equalize the match, this where I blame the manager not only the players, when they were 2:0 ahead the manager would have used a 4 men defense, 4 midfield and 2 attackers at least this would have helped them to maintain the lead and also look for more goals, we never can tell what would have happened if the match ended in a penalty shootout, the own goal was uncalled for but then that where I believe that god of soccer exist, football should be played with determination and a lot of seriousness, although Leverkusen deserved the winning but Roma allowed it to be that way.