One of the things about ridding a motorcycle is that you don't know where the limit is. I remember when I started and some talked about a 20mph knee drag. I thought that's crazy, how can you do that.
I remember seeing some of those Japanese police skills tests and thought, how can they do that?
The thing is that every bike is different. Even every setup (tires, tire condition, suspension, road condition, etc...) is different. You don't know where the bike is going to give way, so you push a bit more, a bit more, a bit more... trying to find the edge or to make sure you're not too close to the edge. Once you go too far, you'll learn where the edge is for THOSE conditions.
What if it was some sand on the corner that did it? Which corner has the sand/oil?
No doubt body position matters.