i've enjoyed this thread..
one thing i haven't seen mentioned yet is-cultivating environmental awareness for access to a weapon (or an exit...).
oh, and 360 degrees awareness
unless of course we were talking about one on one "fair" fighting
But you can't do that all the time
you don't have to do it all the time, but getting to the adrenal state even a few times, realizing its there, your mindset in it, your capabilities, and understandings, etc. will give you an advantage over an oppenent who hasn't been there.