The door of the jail being flung open from within, there appeared, in the first place, like a black shadow emerging into sunshine, the grim and grisly presence of the town-beadle, with a sword by his side and his staff of office in his hand.

Which best describes the purpose of the words “black shadow,” “grim,” “grisly,” and “sword”?
to impart a sorrowful mood
to impart a solemn mood
to establish the early morning setting
to establish the militant jailhouse setting