Well, first option would be to run, as who's to say he doesn't have a stylus as well.
Second option, well you could go for the eyes; however, if he is a raving lunatic then he'd slit your throat before you got half-way there.
Third option, throat jabbing, well I do have the speed and power for that, but, after that he's dead and your f-cked as you killed someone and your going to have to pay the consequences of your actions.
Fourth option (not in any particular order), tear duct, uh no, to build that kind've accuracy against a still target would take at least a few weeks, add crazy, moving, and unpredictable and your not going to hit it unless you walk up to him tell him to stop moving as there's a fly on his face, then jam it down his tear duct....not happening....generally...
Fifth option, urethra, uh maybe if the lunatic was a chick or has a severe case of micro-penis (look it up on wikipedia if you don't know what I'm talking about) then you might have a slight chance with your x-ray vision, their wearing not clothes, or you like to play touchy, feely with your neighbourhood lunatic (then I'd be more worried about running into you). Otherwise not happening as every body is different (unless they happen to be your identical twin) and the only way your getting it there is by luck.
(I'll be back for more once I get to work)