When Guan Yu is struck by a poisoned arrow, the physician Hua Tuo offers to scrape the poison from the bone. Guan Yu calmly plays a game of chess while the surgery is performed, and the scene has become one of the best-known images of composure in the novel. Hua Tuo later appears again when he proposes opening Cao Cao's skull to treat his headaches, and Cao Cao, suspicious, has him imprisoned and killed. These two scenes together raise questions of trust, medicine, and power that work well in ethics-focused writing assignments.

Moral reasoning essays are among the hardest to grade because students tend to treat them as opinion pieces. They announce that Cao Cao was wrong to distrust the doctor or that Guan Yu was admirable, and the essay reads as a list of reactions. The more demanding task is to explain which principles support the judgment and how competing principles might lead to a different conclusion. Hua Tuo's two scenes make that contrast concrete, since one patient trusts and the other does not.

Teachers who assign this topic find that responses fall into recognizable groups. Some students write emotional reactions to Hua Tuo's death, others write careful comparisons of the two patients, and a few raise questions about informed consent and the burden of proof in medicine. Sorting the essays by quality requires a rubric that values reasoning over conviction. Without one, confident but shallow writing can score higher than thoughtful but tentative work.

Grading Reasoning Rather Than Agreement

The first rule for grading ethics essays is that the score should not depend on whether the teacher agrees with the conclusion. A student may argue that Cao Cao's suspicion was understandable given the dangers of his position, and another may argue it was a failure of judgment. Both positions are defensible, and both can earn full marks if the reasoning is sound. Teachers should state this expectation in the rubric so students feel free to take a position.

• States a clear ethical claim about trust, risk, or responsibility
• Identifies the principle behind the claim, such as duty of care or self-preservation
• Uses specific details from both scenes rather than only one
• Considers a serious opposing view before responding to it
• Avoids moralizing language that replaces actual reasoning

Helping Students Weigh Competing Principles

Ethical dilemmas become interesting when two good principles pull in different directions. Cao Cao has a legitimate reason to guard against assassination, while Hua Tuo has a legitimate claim to be heard as a medical professional. Students who recognize both are better prepared to write about the tension than those who side instantly with one party. Teachers can model this by showing a short example paragraph that gives each principle a fair hearing.

Sentence-level coaching helps as well. Phrases such as "obviously" and "clearly" often signal that a student is skipping the explanation. A comment that circles such a word and asks what makes the point obvious is more effective than a general request for depth. Over time, students begin to catch those shortcuts in their own drafts.

Maintaining Fairness in Sensitive Topics

Essays about ethics sometimes touch personal experiences with illness, authority, or trust, and teachers want to respond with care. Feedback should address the writing without passing judgment on the student's values. This is easier to do when the rubric focuses on structure and evidence, since the comments can point to those features rather than to the student's beliefs. A consistent process also protects teachers from unintended bias on contested questions.

AI-assisted feedback supports that goal by evaluating each essay against the same rubric descriptors, regardless of which side the student chose. Teachers review the output and add personal notes where the situation calls for them. The tool does the repetitive work of checking for evidence, counterarguments, and principle statements, which leaves more time for attentive human response. The outcome is feedback that is both quicker and more even-handed.