Ore only needs to come third/second last in the public vote to avoid the dance off. There is a possibility that he'll come last but I don't believe Louise is all that popular (apart from with the celebs on It Takes Two), so if she comes last it'll be her and either Danny or Claudia. Both of them should win against Louise but the judges could just say Louise improved her Tango to beat Claudia's Quickstep. They'd have a hard time convincing anyone that Louise was better than Danny if it was her Tango against his American Smooth. (I'm assuming they do their highest scoring dances in the Dance Off.)