The Doctor knew he had to find her, he was alert and used his sonic screwdriver to scan around. He wondered where they would have taken her, the cell was empty by the time he got there. Mmm where did they take her. He was thinking. He knew that he needed to find her, he had no idea what they were going to do to the Acorina. 
He knew a creature like that was rare these days.
The Doctor was making sure that nothing caught him sneaking around. He always had a plan, He was sure that he could find a way to get her out of this.

After awhile, he could hear shouting and voices, Auction. They were selling her. He knew he didn't have money, could he fake that and run or find some other excuse as to why he didn't have the money on him. The Doctor knew he was clever. Everything would be a risk, but he couldn't leave the poor creature to be sold to just anybody. [i]Think Doctor[/i] was what was going through his head. [i]Come on you can surely come up with something.[/i]
Bidding seemed the only way for now to avoid been caught. He was sure that the plan would work for now, unless somebody knew what he was up to.

He looked towards the girl and smiled a bit. He hoped she would understand that he was trying to save her. There was a voice in her head [i]Just wait and I'll tell you to run.[/i] He began bidding, he would just go higher and higher. Eventually he bidded 200 000 000 credits, he was waiting to see if anybody would go higher, he wouldn't give up.
He knew he had to be careful. [i]Come on [/i] if he could have gotten closer at this point, he would have just grabbed her and ran. He didn't seem to know any other way.