Natalie leaving is absurd, of course, and perfect vindication of my opinion that only professional adjudicators should score dancers. (Yes, this leaves out Bruno and CA) Several people gave worse performances last night. At her age, not having the necessary sexual chemistry with her dance partner is not a major fault, it's just one of many scoring elements.
I'm sure the judges will respond next Monday with more honest scoring for the poorer dancers. I'd predict a wider separation between top and bottom. Perhaps Len being kind in his comments to many marginal dancers last night was, in hindsight, a major mistake.
An afterthought: Louie is a bad joke on the dance floor.