You do not have a killer bee,infact that type of bee sounds like a bumble bee & is one of the most non agressive & docile bee's on earth.
I come in contact with bee's on a regular basis,i see guys run around flailing their arms & screaming like little girls ( Eeeeek a Bee !!!!!!!!) & they are always the ones who get stung all over the place,the guys who calmly go about their business are rarely stung.
Go about your business as if the bee wasnt there & he'll go about his business as if you werent there,the thing to remember is that its just a lil ole bee,if he stings you your heads not going to swell up,your arm will be a tad sore for a few hours at best,you can take that cant ya, afterall its just a bee.