While I agree with the result, I am suspicious of the reasoning. Would someone with pneumonia who coughs on you be assault with a deadly weapon? Would it turn on whether it was involuntary?
Better this guy serve his sentense for incest then getting into this. This case shows the limits of leaving everything to the lawmakers.
I have faith in the jury system and believe that intent would be a factor. Coughing is usually involuntary but covering one's mouth while coughing isn't.