Super Reflexes: Another one of the many things to go into the standard upgrade build, in the sense of better, faster, etc., nerves.  Can, of course, be improved still further if you feel like upgrading your nervous system to milspec, or adding various special cognitive enhancements to run tell analysis and predictive motion routines on everyone in the vicinity, letting you pull off that nifty “see-and-react-to-things-before-they-happen” trick.

(In less deliberately civilized societies, it may be best not to include the “respond automatically and lethally to incoming attacks” option.)