Re: How will the Ponds depart?
The explanation of having the Angels shoot them back in time makes sense, but it fails to account for one or more deaths that SM has promised. I recall an interview way back where he said something to the effect of "not everyone makes it out alive, and I mean it this time."
"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
--Arthur C. Clarke