Kay walked up the rest of the steps and leaned against the bannister nearer to John. "I found out quite a bit actually. It stems back to my mother's first incarnation. It's a bond that comes into fruition between the phoenix and the one they're destined to be linked to. It can happen in two ways. Either through like a marriage style ceremony where one gives themselves to the other or through a selfless act like I did with you, healing you to the point it put my life close to its death. Seems neither of us knowingly triggered it and it was sheer pot luck who triggered it first. You for saving my life or me saving yours" she explained. "that's the short version anyway.." she concluded. 

Chas had never seen the map react in such a way, until now it was a normal map that was just enchanted but it had never done this. "we're here with you every step of the way. If it gets too much,  let go of it" Chas advised.