Most people in the US know that if you talk back to the police, they will get nasty very fast. The fact that the man was black might or might not have made the cop go for his handcuffs even sooner than he might normally have done.
这次事件中不同寻常的并不是警察的暴虐。多数美国人都知道如果跟警察顶嘴，他们很快就会变得气急败坏。这位教授是黑人的事实可能有也可能没有导致警察更快地掏出手铐。这一点也没有什么不同寻常。