How do you know that Benfica will win in front of their fans? The second legs are always more interesting, but they're always played cautiously. Fenerbahce always knows how to perform in important matches, so i think it won't be easy for Benfica to beat them.
Unfortunately, we can't guarantee that Benfica will be able to achieve what they promise to do, but having the fans behind them certainly helps.
I've seen matches where fans cheered until the end, pumping up the team who then turned the result around in a few minutes.
You can't guarantee a win for any team ever. That is not really possible, and that is why we do not know the answer to this game. However, we can make speculations which is the entire betting industry relies on, we do not know the answer and we just try to make a guess. This is the same, we are going to see how this could change, and how we could see better results.
If we can do that, then we are going to end up with Benfica winning, because that is what we speculate, and if you look at the odds, then Benfica is heavily favourited to win at their home ground as well. The only downside is that, they are going to have to win a single game, it's not a league thing, they either win, or they go to Europa, so it's very much an unknown game.