Hex Machina

Bad Ex Machina.

A Hex Machina is like a negative Ex Machina: instead of helping characters with the abrupt appearance of something or someone, it prevents them from doing something very crucial to the story, such as knowing how to get out of a labyrinth or what would kill a monster. A common instant of this UnTrash playing is when someone is reading something (usually important instructions) aloud, then as they reach the word "is", "are", or "by", they get cut off by a Hex Machina, keeping them from continuing reading their instructions. It's now up to this person to Figure It Out alone at a later time.