"I think there probably is," he agrees wryly, and leans forward, folding his arms on the table. "Spike's kind of vampire - and Martha's - they don't have souls. They're demons, and without the soul to act as a conscience, the demon has full rein. But there's a spell that can restore their soul into their body, to make them care again. So the Defence Force, with the help of a few other magic users, got his soul back from the wardens and conjured it back into his body. Don't ask me how they did that - magic really isn't my thing! - but I saw it work."