Yes, Lille will benefit from playing with their fans' support. The situation is still difficult to predict and will depend on the team's readiness and the strategy used by both coaches.
Dortmund or Lille still have a chance to win. It's just that there is a possibility that the match will be decided by extra time or even a penalty shootout. When both teams cannot win in normal time, then the next thing is about their mentality.
I don't see the chance of the game ending in a draw for the second leg and I am sure both Lille and Dortmund will try their best to finish the match in normal time. The situation is indeed quite advantageous for Lille, but that does not mean Dortmund will let them play more openly to beat them easily. The coach's strategy will determine the steps of one of the two to qualify for the next round and I am sure there will be a surprise later. The question of mentality may be determined based on experience and in this case Dortmund will be much better but there is no greater guarantee for them to win the match.
Dortmund did have a high mentality in the Champion League match but now everything is different because it is not only the mentality that determines but the strength and performance of a team that we can see as a whole this season.
Dortmund's performance this season has been inconsistent even though after changing coaches their performance has improved slightly and even showed impressive performance in the Bundesliga but what happened in the first leg against Lille proved the fierce competition in the Champion League.
now we are realistic that Dortmund will have a little difficulty in the second leg later because Lille who will play at home with Agg which is still a draw of course has much greater motivation.