The boy jumped up in surprise suddenly, but it wasn't because Jon sneezed on him ... at least not directly because. "Wha ... what's happening to me?!"
Jon looked up at the boy in complete shock, as he watched the boy begin to change right before his eyes.
What Jon would eventually figure out was that the yellow mucus that he sneezed out had the ability to change people or even things into whatever he imagined. The only thing that the mucus couldn't change was Jon himself.
When the boy stopped changing, Jon saw ...