I skimmed the article but I didn't see any examples of this being exploited... Has anybody done a proof of concept on how Bidi can be used? I'm having trouble

I skimmed the article but I didn't see any examples of this being exploited... Has anybody done a proof of concept on how Bidi can be used? I'm having trouble thinking of a line of code with a comment or literal where the code is legit forwards but malicious backwards.