Eleven
There is no such thing as plenty of time when it comes to the Master. You of all people should know this. Right now he is plotting, setting all of us up. And the worst part? Romana stands beside him the whole time.
I cannot allow Elizaveta to exist. I can't. Do you even know what the demon child is planning? She will rip time and space apart to restore Gallifrey and the Time Lords. I will not allow her to do that.
I won't go around shoving my gun in people's faces, but you must understand the severity of the situation at hand. Something must be done now before he can carry out his plans further than he all ready has, before he destroys Romana and helps Lucifer win the fucking Apocalypse. That is what Althea believes she is the sacrifice for, to keep our future from happening.
{OOC: Yes, River just used the F bomb. For the first time like...ever.]