The words that descrive the noun agreement in the sentence are abstract, singular, common.
The noun agreement is abstract due to the fact that it conveys an idea, condition or characteristic instead of a concret object. It is also singular because it refers to one thing and in the example sentence it does not take the plural form. Finally, it is common since it does not apply to a specific person, place or thing, as in the case of proper nouns.
It all depends what time period It is I guess. In the 50s a black man could've gotten killed. If he was white anything could've happened. Even killings.
