The Doctor is just trying to figure out exactly what happened and he sits there a bit ruffled. The squeaking perks up his interest and he opens up his wings. "This is going to make things just a little bit more complicated."

If The Doctor only knew the little mouse was Master but that's for another time. "Blimey, this is bad and in bad that's not exactly good." The Doctor tries to keep those predatory instincts from taking over to find the mouse a tasty meal.