If they eventually have the upper hand at the beginning of the game and they have the chance to put in more goals before the time runs out then they might want to consider taking a revenge game on Bayern , so far they can maintain their position then going for it shouldn't be bad actually.
However, I don't think Hansi Flick will want  a revenge game though he might want as many as possible goals but taking it to a revenge plan... he absolutely won't do that even if they have the chance to proof that  and that's if its possible in the first place, Barcelona has some serious game ahead apart from UCL so securing the win might  just be their target.