"Only time I've heard of that is mythology type of contexts, phoenix. But anything out there like it... Not exactly common, the whole coming-back-from-death thing, especially without a body."
He looks over at the Doctor and frowns a bit, trying to get his head around that on top of the head-spinning revelation he's trying not to let sink in. If he lets it do that, he's likely to freak out. "Do you feel like you're part her, not just part human? Some self-doubt jumping in the way?" This incarnation of the Doctor, the half-human and not, he's seen have so much bravado and confidence and brilliance, yet there's that flip side too where he's so much more... not. Always brilliant, yes, but sometimes that crushing guilt and grief comes in. Maybe the Donna part adds to it. "Getting any human cravings with it, like ice cream and films?"