甲携带凶器拦路抢劫,黑夜中遇到乙便实施暴力,乙发现是自己的熟人甲,便喊甲的名字,甲一听便住手,还向乙道歉说:“对不起,认错人了。”甲的行为属于下列哪一种情形?
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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