here. Cajal must cope with responsibility and guilt but not also with personal danger.
When Rudi Mackenzie is with a band of Sioux who are being challenged to single combat, he says, "'I'll take this one...'" (p. 395) (see here), i.e., he volunteers to fight. How will Rudi live long enough to lead his people if he keeps risking his life like this?
Of course, as the hero of an action novel and even of a series of novels, Rudi leads a charmed life but he does not know that! He will either not die during the series or will die in a significant way at the climax of a novel as his father did. But meanwhile is it plausible that someone whose life is continually in danger can be relied on to survive indefinitely and also to remain physically intact? One of his Quest companions has already lost an eye and they still have a long way to go through often hostile territory.