update: swiftly I jumped into action, blowing my nose in startlment. the fly, equally startled, reacted just as swiftly by flapping it's wings vigirously. as a result it went nowhere. in a bezerker rage at this point, I gave a fearsome howl and blew my nose again. the fly dizzily fluttered out, as my boss lumbered in to see what the fuss was about. still in a berzerker rage, I preseved him as a threat as he was invading my territory, and pounced.
I don't actually remember much of what happened next, just a lot of red.
in any case, the fly continues to buzz around the lights, my boss has a few stitches and occassionally gives me an odd looks, and I keep finding myself in the woods without pants covered in scratches.