Based on the context of the sentence, the words "barbarity" and "consummate" can be inferred as follows:
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"Barbarity" refers to extreme acts of cruelty or savagery, especially in relation to the treatment of others. The description of "savage barbarity" suggests brutality and violence.
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"Consummate" implies a high level of skill, perfection, or completeness. The phrase "consummate coolness" indicates a mastery of maintaining composure or control.
Thus, the best matching response is:
Brutality and violence, perfect and skillful.