Boil
If someone wants to boil, you let them boil!
There's someone in your face yelling about how they want to boil! You yell back, "Okay, if you want to boil, just boil!"
しゃ
に
None
Welp, the pot is at a rolling boil and your knee (に) is in there. The person wasn't saying they wanted to boil, they said they wanted to boil someone. And that meant you. Well, your knee anyway.
Once your knee is done boiling, the person kneels down in front of you and presents it on a platter, mocking you, since you can't kneel anymore. You should pay more attention to what's going on from now on or you could find yourself in... HOT WATER. Ohohoho.