The Master completely ignored her little rant. Instead he merely wondered whether she was going to continue her useless attacks on the force-field. He gives her a stern look.
"If your Doctor is so smart, then why hasn't he solved the bigger picture yet? People are falling through time, space, and dimensions to end up here. Why? I know the Doctor a great deal better than you. And do you know what I think? I think he hasn't even thought about it. He is too busy running off on his little adventures to see the really big problems when they happen. Do you even understand the massive amounts of energy it would take to open up dimensional space again? The time lords are gone and the daleks haven't tried to kill us all. So that begs the question of who or what is doing this?"