The Doctor grinned when she said it was bigger on the inside. How he loved to hear those words. He was leaning against a wall. He knew they were safe inside the TARDIS and that nobody could get in. He was also planning to get them away from the area.
He wasn't sure if she knew that she was now safe inside his TARDIS.

"No they won't us because not just anybody can get in, we are safe in here, Plus this is a spaceship and time machine." He was grinning. He was looking around. He walked over to the console. "No need to hide."
He started flicking various controls. He knew that getting them out of the way of danger was the first thing. Even if they were safe in the TARDIS. It was best to get away from those men.
He wanted to keep her safe as he could.

The Doctor was quiet for awhile as he flew the TARDIS. He seemed to be concentrating. He was trying to think of how she was able to hide what she was. He knew he would her safe. But he didn't want her be in too much trouble each time. Once they were in the vortex, He looked around. "Is there a way you can appear human? If so might be easier to avoid been sighted when we are out, can't hide in the TARDIS forever. Either way Id keep you safe, But we need some way to avoid you getting in danger."