Sirius could see that James was floundering a little, and it was more than a little strange. James never needed confirmation of his ideas... Looked like some best friend back up was needed.
"James is right!" Sirius jumped up and stood next to James. "Who knows what the Hell is going on out there, but I for one don't see any way extra defense could be a bad thing. In dueling club we learn to play by the rules, but do you think that pack of nutters is going to stand back and take turns when it comes to an all out fight? You think Jelly Legs will save your arse when it's on the line? We need to know the real stuff, the stuff the other side knows. And believe me, they do." He took a deep breath, wondering if this was a good idea, then decided that he'd never cared about that before so why start now... He lifted his shirt, revealing mottled, indented scars running from his chest down below the waist band on his trousers, and the words Traitor branded into his skin just above his navel.
"They know more than you can possibly imagine, and they won't hesitate to use it."