Diarrhea, Diarrhoea
You ate some grains that made you so sick it feels like a knife is stabbing in your guts and all your poop is falling out. This is called diarrhea. Everyone's had diarrhea before, so you should know this feeling by now.
Imagine back to the last time you ate something bad and it gave you diarrhea. It felt like someone was sticking you with a knife, didn't it?
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The diarrhea is here. It's happening. And it smells so awful you can't breathe. You have to take some hollow reeds (り) and shove them up your nose and out the bathroom door so you can get some fresh air in you.
You learned this reed technique from a group of ninjas who use them to breathe underwater, and you never thought you'd use them like this.