How does the author use foreshadowing in Doomsday Book?

One instance of foreshadowing occurs when Gilchrist argues against reopening the net to retrieve Kivrin. During that conversation, Gilchrist argues there's no way to be certain a virus won't come through. He argues probabilities and Dunworthy says "probability" has estimated that there's more of a chance that her arrival in 1320 would be witnessed than that a virus could travel through the net, but Gilchrist is willing to discount that possibility. At one point, Gilchrist says Kivrin knew the risks and Dunworthy asks if Kivrin knew he would be willing to abandon her, but the jab apparently doesn't make any difference to Gilchrist. Dunworthy notes that Gilchrist, having realized he isn't going to have a successful trip to 1320 to report to Basingame, now just wants to protect himself from further fallout.