Jon said to himself "Think! You've got to get that stone..."
Jon had to figure out some way to cover himself up. Anything would be better than getting caught naked in the girl's washroom when he had a bleeding vagina. Then Jon came up with a plan. He pried open one of the toilet paper dispensers, and started wrapping himself up in a makeshift outfit. He figured that all he needed was something that looked like underwear, maybe with a little extra padding in the crotch.
It took Jon several tries before he had something that looked like a pair of toilet paper boxer shorts, with a reasonable-sized bulge in the front. Satisfied that this was the best he could do with the materials at hand, Jon cautiously stepped out of the washroom, still trying not to be seen if he could help it.
Then, to Jon's shock and horror, he realized...