It has to do with how these time streams are begun.

Our memories may shift to accommodate the new time stream.

The events of this episode are erased from the time stream.

Suppose that, every now and then, a hole appears in the time stream?

As I said, perhaps the time stream attempting to heal itself.

This, of course, was possible since it takes, even in practice, almost no energy to move a body relative to the time stream.

He could feel other presences too, moving around him in the time stream.

The cosmologists tell us that there are many time streams.

"If we decide to go, you can always back up the time stream a little."

But removing him from the continuum's time stream is just as good.