Theres an HB 8 that usually hangs out with my group of friends. Well she has a major B shield and usually we're cool. Today she was just a straight up B to me and i didn't know how to handle it. She just tore me down and walked off. Any advice on how to handle it and redeem myself?

What's your goal? Think about this first . . .

My best suggestion would be to ignore it as harsh as that sounds. Women will put you through tests trying to qualify you, when they do something harsh they wait for your reaction. The best thing you can do is not care. If you have known her for a long while then you need to start spiking DHV and letting her know your in control, at the same time let her know that you are not interested in her, with comments like: I can tell you and me won't be able to get along, cause we are too much alike, we would fight like cat and dog and I would always win.... or I'm not boyfriend material you should look for a guy like that..... or your to much of a nice girl for me...
to lower her B shield you must show her your not interested. once she lowers it, you can proceed to the next step in providing comfort once she has giving you IOI's.

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Regret Nothing, Accomplish Everything

Neg her back and show your not scared of her. She just might come around when she finds out your not going to be walked all over. Plus she could be like back in 3rd grade the girls that hit you are the ones that like you. You could even tell her that. Phrased differently of course.