Borussia Dortmund are highly effective at home, averaging over two goals per game, but their defense is prone to errors. Bayer, on the other hand, boasts one of the most potent attacks in the league, as evidenced by recent big wins, including an away victory. Historically, head-to-head matches between these teams almost always result in high-scoring goals.
Considering the attacking potential of both teams, their current form, and their head-to-head record (the teams met a couple of days ago in the Bundesliga, when Borussia won 1-2 away), a goal-sharp encounter seems the most likely outcome. Both teams have enough firepower to find the other's back.