system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] How is the Eleventh Doctor able to talk for so long in front of his enemies without one of them shooting him mid-sentence?
gpt
His principle enemies aren't stupid. A number of them *have* caused the Doctor to Regenerate, or other Time Lords. Here's the thing about the Doctor:

1. Most of his enemies are so anxious around him that they generally wait for him to make the first move of any sort. He's a time traveler and objectively smarter than they are, and they know it. They presume they begin at a disadvantage.
2. Shooting the Doctor to kill him is not a guarantee. If he can get off the Regeneration quick enough, for the next day or so he's unstoppable, moreso than normal. 
3. For emphasis, the worst case scenario for any opponent of the Doctor is him regenerating. Now the bastard is literally overflowing with phenomenal cosmic power, and he, on the record, has no qualms about using it against you.

There's a reason he was so pissed off at the Family of Blood, and the Angels: they hit him in the ways that can hurt him most, by taking his identity and friends from him.

Shooting the Doctor is suicide.