Thoughts On A Battlefield

Riding into battle at Rignano in 1137, Manse Everard thinks:

"Wanda's up in that future we mean to kill. She must be; she hasn't come back." (The Shield Of Time, p. 343)

Everard does not know this. Most time travelers who returned uptime from periods pre-1137 entered the future of the Danellian/Time Patrol timeline, not of the alpha timeline. Thus, he does not know which of these futures Wanda had entered.

"From that last moment in the Ice Age, her world line will reach uptime and come to an end." (pp. 343-344)

No, it won't. If she entered the future of the currently "deleted" Time Patrol timeline, then her world line continued in that timeline. If she entered the future of the alpha timeline, then she will either return from it (this in fact happens) or remain in it. In the latter case, she, like the rest of the entire alpha timeline, will be (Temporal tense needed) in the past of the second temporal dimension - which is not explicitly acknowledged but is nevertheless clearly implied by the logic of variable reality as discussed in the series.

"It won't unravel into the tracks of single atoms, this isn't natural death and dissolution, it's nothingness." (ibid.)

There is such a state as nothingness. It is the condition of all the potential organisms that have never been born in any timeline, all the beings that would have existed if only a particular sperm and a particular egg had met. What happens when we die? We either enter a hereafter or return to nothingness but at least we have lived. Wanda has lived so her "nothingness" is not that of a potential being that has never been born anywhere anytime.

When Everard stuns Lorenzo, he alters events and thus brings it about that the alpha timeline does not emerge from the battle of Rignano. However, Lorenzo's capacity to alter the timeline continues to function:

"Somehow [Lorenzo] didn't fall from the saddle. He sprawled along the neck of his horse, which whinnied and skittered aside. Were the rider's reflexes so good as to keep him there, even unconscious? In that case, he'd soon wake up, none the worse. He'd guess somebody had dealt him a blow from behind, hard enough to knock him out through the mail and quilting on his neck.
"Everard hoped so." (p. 346)

Sure Lorenzo will think this but that does not mean that the Time Patrol timeline has been restored.