BnZ is more specifically a method of engagement: Hit and run tactics combined with energy management. Ideally you hit at high speed, then extend--usually in the vertical--and repeat. The REAL object is to maintain separation of no more than 2-3k, concentrated in the vertical, and making repeated slashing passes and utilizing other E-fighting techniques until your target runs out of energy. If executed properly you shouldn't extend outside of 3000 yards before reversing, which keeps your opponent entirely on the defensive and denies him an opportunity to equalize the situation.
Don't confuse it with Tempests, Ponies and Doras making mach speed passes from outside of icon range and retreating BACK outside icon range as soon as they miss.