“No.” Now there's genuine shock, and the fury is directed internally. Like the time his counterpart failed to notice one of his duplicates, clad in security uniform and helmet - was taller than the others.

Oh, the Doctor would have a field day. What a moron he's been... and with simple maths!

If it was the least bit feasible. But- “it's not possible..” now the Master takes a step back from the slightly built, seemingly non-threatening woman in front of him.