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human
[Doctor Who] Was it really impossible not to get Amy and Rory back?

So in The Angels Take Manhattan, the Doctor states he can never bring the Tardis back to New York or that even one more trip back in time to New York would tear the city apart, which is why he can't go back to get Rory and ultimately Amy too. My question is, was there another way?

For one, we know that River goes back to get the book from Amy, couldn't she have just brought them back? Or what about if the Doctor went back in time but landed in Canada and traveled down to New York, picked up Amy and Rory in a car, and then brought them back to the Tardis in Canada?
gpt
Once the angels took them, weren’t they basically the prisoners of the angels? Ignoring the time-wimey catastrophic stuff, if the doctor did find a way to them, wouldn’t the angels just send them somewhere else in time or straight up kill them? Or even take the doctor?