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I agree with the 45 degree move followed by either running away or trying to stay behind the attacker if you can't escape; keep moving...keep off the "X" and continue to reset the attacker's OODA loop.

Not unusual at all. The only shot to instantly stop the BG is to hit the computer (head). Otherwise, if you hit some major pipes, bleed out/blood pressure drop can take up to two minutes. People in really good physical shape can take a hit in the heart and still be active for several minutes. I learned this info from a two-day class with Steve Tarani.