I sat across from him, my back to the door.

Now, I shall sit with my back to the door.

Sean did not move from where he sat against the wall next to the back door.

Rachel turned and sat with her back to the door.

It went and sat with its back to the door.

A man was sitting at an old table, his back to the door.

Then he sat in the armchair with his back to the door.

She was sitting with her back to the door, you see.

In the center, on a stool, sat a man with his back to the door; never a good thing.

We were sitting on the floor with our backs to the door.