No Other Choice

The worst one-way road known to fiction.

When a character must do something as they have no other available option at that moment. This "something" the character must do is usually an undesirable action, such as killing one of their friends to proceed in a task, or stand around and do nothing as they are stuck in prison or another Inescapable Trap. When There Is No Choice, there is often some hesitation to move forward even though moving forward is the only thing the playing character can do. If There Is No Choice doesn't mean the character can't choose what they want to do next, then it may instead mean that they are forced down a One-Way Path that typically leads to that character's death. The thing that pushes the character forward might be a Killer Boulder, Angry Mob, or Killer Monster that chases the character down a single, narrow road they must continue to rush down if they want to continue living.