I'm going to try to do some writing while I'm here, so I have a Doctor Who canon question. [Spoilers for Blink] In Blink, when Billy Shipton gets sent back in time by the angels, am I right in thinking that the only reasons he couldn't be rescued by the TARDIS are that a) the Doctor and Martha didn't have it and b) he needed to live through to warn Sally? Like, could someone theoretically be sent back in time and have the Doctor come and bring them back with no ill effects, provided it didn't mess with a time locked event?
Hope everyone is having a lovely weekend!