system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] Why did the Doctor's TARDIS allow the master to fly it?

The TARDIS is sentient, and apparently very loyal to the doctor, to the point of love perhaps (the doctor's wife). So why is the master able to pilot it (Utopia et al)? 

I know he was only able to travel between two points, but that was the Doctor's interference. Shouldn't the TARDIS itself have said 'screw you dude, we're not abandoning the doctor here' and put the brakes on?
gpt
A timelord would know how to force a tardis to go where he wanted. She is still, when it comes down to it, a vehicle, and in the end its not her choice, if someone wants to force her, he can. The master might be better then the doctor at flying a tardis, so he might know how to force her when the doctor does not (he did however force her to go to trenzalore, so he can probably do it)