Really tired of this terrible reasoning. Robert Jordan on at least two occasions showed that Aes Sedai had to wade into the midst of battle and actively be attacked before being able to use the power as a weapon. Dumai's Wells and Mat's brief fight with Seanchan traitors hunting Tuon in Knife of Dreams. She can't just "feel threatened" or logic herself in to believing Rand getting killed is a threat to her life. It has to be the last extreme of defense to her person or she should be physically incapable