Sentence:  Read literally, that "as" means that Stephan renders the oft-depicted scene from Ovid as follows: Leda, the raped, has become the metamorphosed Zeus, the rapist, and is therefore caught up in a hopeless knot of <WSD>self-rape</WSD>. 
Meaning of the word marked with <WSD> tags:  An act of rape where the rapist identifies with or is the same as the victim.