I'd play devil's advocate here and say that I give Bing a slight benefit of the doubt. Given they cannot perform a parallel Google search on every single user query (this would have been easiest to spot), the technique cannot be of the form "if on google, do x". Rather, it is likely they look at what users search and what results they get as one of the parameters, say normally influencing 0.2% of the search ordering on average (assuming 500 "signals"). In the case of "torsorophy", out of the 500 "signals" only one came up, the Google result (via Bing toolbar from a few users). So, their algorithm makes a note of that, like, hmm... I don't really have anything else so I'd just rehash what users have searched and subsequently visited. So the 0.2% becomes 100%, and internally Bing associates the word "torsorophy" with that website. Next time "torsorophy" is searched it returns that site.

Yes, Bing is likely using Google's data (if available, via Bing toolbar) as part of the ingredients. You can argue whether this is stealing or not, whether this is Google results or user search/visit behavior, and but I would say it isn't exactly "if on google, do x".