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I don't know if you're asking us how difficult it would be or if this is an actual question for a school assignment, but yeah. A lot of communication is conveyed through facial expressions, body language, eye contact, gestures, and more, so to only communicate by talking would be pretty challenging. Luckily, we'd still be able to fluctuate our tone of voice, but having a blank, emotionless face without us being able to move our shoulders or use our hands would take time getting used to.
Your answer to this will be the last sentence.
However, he deserves little credit, for since that time, still greater strides have been made in battlefield medicine.
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Although the sentence is incomplete, I think that's the correct one. Both Harrison and the ballerina get killed, restoring the world to its previous situations, but their actions don't inspire rebellion and not everybody ends up happy. Harrison's parents don't, although they don't know why they are sad.