In the bowls of the TARDIS there is a fowl smell loafing through the vents. If investigated coming into the room, one will find a bigger purple snake coiled around a male, glasses smashed with a broken twig beside him (Harry Potter) and in the corner, body (Rose Tyler) torn to shreds, blonde strains of hair, scattered all over the room.
[Like always this is just a starting point. Feel free to make other threads to reactions to it or looking to kill the two snakes.]