The second leg match between Roma vs Salzburg will be presented at the Olimpico stadium on Thursday. I think this time Roma will win this match, we know in the first leg Roma have to lose to hosts Salzburg with a score of 1-0 and this will be a very tough homework for Coach Jose Mourinho to achieve full aggregate points so they can qualify to the next round of the Europa League. Roma must at least score 2 goals in this match and most importantly they cannot lose.
Roma have been playing well at home this season... They usually don't concede goals, but within the Europa League anything can happen... Especially Salzburg recently played Bayern 4-4 but lost 4-0 to Inter... I find it hard to call Roma the favourites in this match... As you said, Roma are in a difficult situation and it will not be easy for them to score two goals against Salzburg...
It is true that Roma are so strong when playing at home, if we take a quick look at Roma's statistics in the last 10 matches at home in all competitions, they have managed to get 6 wins, 3 defeats and 1 draw. Actually, this result is quite good considering that they are very superior when playing at home and the support from Romanisti will always be with their favorite team in the match against Salzburg in the second leg later. Even though it sounds difficult, I think Roma will still win and I don't rule out the match going to extra time.