It depends on what the guy does.
If you are going much slower than him as he beams down on your 6 then you should push forward down and do a left/right nose down turn. This sets you up for a lag roll. You do it when they are following you about to black out. Now of course if they miss they are gonna come back around. You do the same move again. The nose down turn allows you to get some E every time. The key is to get them to follow you in the turn. It takes practice!! Every time they roll around and come back on you they lose E and or get impatient. Once they follow you they will still have a slight bit more E than you. You can lag roll them, they will go vert and you might be able to get a shot. Or they will try to roll too crushing all their E, however you are going slower so you can get inside easier. If you have a better turning plane you should win. It takes a lot of practice, but this is how you take care of BnZers.
I always recommend pushing forward down as a plane is coming on your 6. If you can stay under the attackers nose. They will generally miss from blackout or loss of sight on you. Giving you a chance for a reverse maneuver.