Private message to Barty

You've seen Snape's screed, I'm assuming.

I wonder whether I could persuade them I'd seen the light and be welcomed into their folds the way he apparently has. They'd have to be stupid to trust anything I said, but with a little bit of setup I could feed them some useful information to show my bona fides, and they do rather seem inclined to take the most charitable interpretation possible for motives.

Mind you, then I'd have to decide what to do with any information I found, and I am more tempted to sit back and watch things burn; 'what is truth', said jesting Pilate, and washed his hands.