This is the core of one of my favorite Mac theories. The fae queens owed Arthur, even Morgana who had tried to kill him and destroy Camelot. So when he goes there, suffering a fatal abdomen wound, they are waiting to heal him. I find the parallel with Mac in CDs uncanny. Maeve pointing out the irony of it, Mab removing the bullet without any sort of deal towards it. Feel like it was preowed from his previous actions.(this doesn't unmake who ELSE he is, it's just his likely earthly identity. I'm totally down with him ALSO becoming or coming from angelic stock)