The usefulness of live concert in the field of black metal is a debatable matter. My opinion is that black metal is not a music genre to be performed live, at least within the stupid and superficial 'rock' or 'metal' context.
One exception to the rule is one man band The One. I think that any band that feels they cannot do without playing live, should study a concert of The One. They play as a duo, presenting a freeform interpretation of the songs as they are recorded on cd, the visual result being in perfect accordance with the spirit of the music. All in all this is the definition of a black metal live show (or ritual as many bands call it flattering themselves). Dark, mesmerizing and acting as an alternative execution of the records. Not for the drunk imbecile headbanger.