A judge may impose the death penalty for particularly heinous offenses, such as murder or terrorist acts. In most African countries, the death penalty is imposed via hanging.
One method of strangulation is the hanging, in which a noose is tightened around a person’s neck using just the force of gravity. The noose restricts breathing because it squeezes the windpipe. The carotid arteries, which supply the brain with oxygen and nutrients, are likewise compressed.
A black hood or fabric is traditionally used to hide the condemned person’s face during the hanging process...READ FULL; FROM THE SOURCE.
Nigerialawguru claims that convicts’ faces are hidden before execution for good cause.
One reason is to keep the arrested person’s identity secret until after their identification has been confirmed by witnesses and written down.
They don’t want the inmates to be able to see when the lever will be lifted, because that would cause them to panic and flinch before they die.
The enlarged or blackened face, swollen eyes, long neck, etc., that occur from an unnatural death are concealed from onlookers by a hood, which is why hoods are used to cover the face of a prisoner who is being punished. The condemned can at least keep up the pretense of respectability by keeping their heads covered.
The executioner, the magistrate, and any other authorities present at the time of the execution should experience as little shock and discomfort as possible.

This is what they called enyiba enyi