Sentence:  Keeping both American theater and its double within the sight lines, I would like to look at MPD as a pathology in which both both <WSD>performativity</WSD> and social performance are outstripped by a mise-en-scène that veers past the merely performative and dangerously close to theater itself, threatening to erase the differences in its very misappearance. 
Meaning of the word marked with <WSD> tags:  The quality of being performative.