Problem, Question
If you run into a gate mouth first, you’re going to have a problem. Smashing your mouth into a gate is going to hurt. A lot. The problem you’re now in is one of getting to a hospital and having your mouth sewn back on. The question is, how are you going to get to the hospital?
Imagine having your mouth bashed into a gate. It’s going to hurt. Imagine how painful this would be and how problematic it is. Imagine that the only question in your mind is how to get to the hospital as quickly as you possibly can.
もん
と, とん
None
The reason you ran mouth first into this gate was because you were being chased by a monster (もん). A monster in and of itself is a big enough problem as is, let alone smashing your mouth into a gate. You poor, hapless soul.
Monsters are scary. Maybe you’ve had a dream where you were being chased by one. Remember how scary that is when you see this kanji.