I don't think that would be buying time. He must have had something done to him in my opinion. Chair is clever, but I don't think this Lambs thing would be unprovoked.
And anyway, there aren't any people we know are 100% good, so there would be a risk he wouldve targeted someone who is actually evil. And if he did target someone evil, he wouldn't actually say that he'd become evil, would he?
I think we need to solve this lamb thing, unless someone comes up with any other information.