I also don't make deals with kids. Never have. Ask Stiles Stilinski if you want proof of that one.
Don't underestimate the power of Hell. Just don't.
What, she compared him to Lucifer, apparently. Right now? Kind of seeing her point. And did you miss all the times I just haven't gotten involved any more when she's gone on rants about Kol's siblings? Ruby rants, it's what she does. You only care now she's mentioned your brother.