>>96681525Imagine it like this
You see something that makes you scream
You scream until you run out if breath
But your vocal cords are still trying to scream
You realize that you can't stop trying to scream no matter how hard you try, and you can't make other sounds because you're stuck in a silent scream
The question is basically what happened to Iroha to make her subconscious want to scream and never stop. Typically this is a problem that affects children who encountered something traumatic, like their house burning down. It's pretty uncommon for adults to develop it.