Or leave a message for them in an earlier year. Or send someone else to pick them up...
Although I guess it's possible that even interacting or communicating with them in some way could be dangerous and could upset the timeline.
it. I really don't know how so many people aren't getting this, considering the Doctor was ranting about it the entire
episode. It's why he got so upset about Amy reading ahead, why he was angry that River broke her wrist, and why he was devastated when he realized what room he was in where Rory died. He also went and flat-out told us that causing another paradox would be disastrous...
I mean, what more did they have to do to make you (the collective you, not you personally, davejames
) understand this? They already beat you over the head with it.