"That sounds difficult."
Who can use it: Anyone except the person playing the main character.
When you can use it: In response to the person playing the main character describing her character doing something difficult.
What it does: In order to do the thing she described, the person playing the main character must spend a moment of awareness. If she cannot, then she cannot do the thing she said and must change it.
As always when spending a moment of awareness, someone playing a character present in the encounter can help by spending awareness on her behalf, which would allow her to accomplish the thing she described. Provide some description of how you provide help.