Final answer:
The provided literary excerpts center around the theme of moral dilemma and the psychological impact of blood-related situations, showcasing the intertwining of humanity and ethics in literary narratives.
Step-by-step explanation:
The excerpts provided are taken from literary pieces, and they explore the theme of moral dilemma and the emotional stress associated with life-or-death situations, particularly those involving blood and its connotations. Whether it is the fear of revealing a blood transfusion, the guilt associated with spilling blood, or the supernatural transformation referenced in the werewolf story, each excerpt delves into the psychological impact of such experiences on the characters involved. Moreover, the depictions of characters wrestling with these dilemmas help to illustrate the broader themes of humanity, ethics, courage, and self-sacrifice found within the literature.