Calling the Master a mistake and a disease is really something else seeing how much training Rassilon and his schooling gave to the Master like calling the Master a mistake (even one of their making) is like a pyrochemist being honestly surprised when an explosive blaze happens when they introduce fire to a bit of magnesium in the middle of a space full of hydrogen. Like cool story, because I’m more than positive y’all knew what you were doing and what would happen.