There's a pause, while the Dalek does a scan for targetting errors. It turns it's gun back so that it's pointing at Rose again, and fires.

(Nononononono)

The gun moves sharply to the side, and the beam hits the door besides her. The Dalek fires again, and again, each time moving it's aim before it can hit her and firing into the wall.

"Why can I not exterminate you?" It fires again. "What have you done to me?" And again. It asks questions, louder and louder, firing to each side of her and every time getting steadily closer to her, but never hitting her. The Dalek wants to exterminate her, but it can't. It can't bring itself to.

It orders her to come near, and has her stand, facing the camera, with it's gun at her back. With a flick of it's mind, it activates the camera.

"I have your assistant, Doctor. You will comply in opening the door or she will be exterminated!." The Doctor argues, and the Dalek doesn't quite care enough to listen. It knows he'll open it eventually.

When the Doctor is finished, the Dalek speaks again.
"What good are emotions," It asks slowly. "If you cannot save the woman you love?"

There's a long wait, and the Dalek doesn't mind that. Eventually, the door opens, and the Dalek trundles through.