Things, even people have a way of leaking into each other like flavours when you cook.

"Also, on account of the odd relationship between time and space, the people who do manage to time-jump sometimes space-jump at the same time and end up in places where they simply don't belong. Over there, for example," he said as a raucous DeLorean sports car rared into view from nowhere, "is that crazy American professorwho can't seem to stay put in one time, and, I must say, there is an absolute plague of of killer robots from the future being sent to change the past. Sleeping there under that banyan tree is a certain Hank Morgan of Hartford, Connecticut, who was accidentally transported one day back to King Arthur's Court, and stayed there until Merlin put him to sleep for 1300 thirteen hundred years. He was suppsoed to wake up back in his own time, but look at this lazy fellow! He's still snoring away, and has missed his slot."

In the end, you write the book that grabs you by the throat and demands to be written.