"Time travel is complicated and there are lots of rules that are in place for a good reason. And one of the big ones is not to cross your timeline. That is if you want to run the risk of creating a paradox." Jack tries his best to explain how it works, and then he goes to the reasons about The Doctor and his problems with the Time Lords.

With a clear of his throat and a cream puff later, Jack tries to think. "My friend is wanted mainly for going back on his time line and saving someone who ought to be dead. Lets just say, the Time Lords aren't exactly happy about him playing with the very web of time in such a manner." Jack stops himself. "And for the most part, doing this is bad and it can result in a catastrophic chain of events."