[quote=ImportantNobody]
Mwahahaha! You've activated my trap card! You do know that she shoots fire from her nose by accident when she sneezes, right? And would the sneezing interrupt the coughing? Can one sneeze and cough at the same time?
[/quote]

:P
No, just one or the other, but Niks didn't know that Evvie sneezes fire and as far as he knew, when someone's in a fit of sneezing and coughing, they generally tend to be to distracted to do anything but standing around or having a weak knee. 

Besides, she'd still cough more and sometimes, her sneeze would be interrupted by her cough anyway. :P
Of course, when she started snorting fire, he'll stay away and try to pelt her with more symptoms, like fever or something. 
It's great that Niks' miasma couldn't kill huh? Just make them really really sick and miserable that might feel a bit like dying. But won't die anyway.