Final answer:
The question suggests that Dr. Hibbert may confuse amputating a leg for something else, but the provided context does not specify what that confusion is. Considering the stressful war-time conditions and extended periods of work, it is implied such circumstances could lead to possible confusion or errors during surgeries.
Step-by-step explanation:
What Dr. Hibbert confuses for amputating a leg is not clearly stated within the context provided. However, we can deduce from the texts shared that amidst the chaos of war-time surgery, exhaustion, and the urgent pace needed to save lives, surgeons like Dr. Edward and Dr. Lakeby could have potentially faced confusion due to fatigue and stress. In the case of Dr. Edward, working up to sixty hours straight without pause in a bombarded hospital, and in the case of Dr. Lakeby, the trauma of personal injury and a lifetime of practice, it's conceivable that the mental and physical toll could lead to confusion and errors, such as amputating a leg when it might not have been necessary, or confusing which leg to amputate.
In the given texts, boxes of amputated legs signify the high volume of such surgeries that took place, contributing to the possibility of confusion in such extreme circumstances.