Crowley was normally honest with Ruby. Okay, so he held stuff back a lot, usually played cards close to his chest, but he didn't lie to her, didn't try to manipulate her in ways he did so frequently to others. She was on his list, after all.
Luckily, languages was one of his skills. He was fluent in most human ones, did so help with making deals after all, and several of the ancient languages were just interesting. And could so frequently give the valuable information. Like right now, just as a random example.
When it came to magic though, both of them knew their stuff. Crowley had been raised by a witch, a woman who had taught him all her tricks. And Ruby had apprenticed to one of the most powerful around. "You're right." And it was difficult to actually admit. "I can't see an option other than blood magic. Not much more powerful than blood. Use it as a physical representation of the emotional connection people have." It was a sound idea in theory, even with the many many risks involved. But it would also need a lot of people working together.
"Question is, will everyone in the Cage have someone willing to do that for them?"