As soon as she touches the hilt, she is pulled into a vision. She could resist and it will not be forced on her against her will, but the vision pulses with desperation and a yearning, a plea to be heard, to have its existence acknowledged.
There was an angel once, called Lariel, who stood in this cave or another like it and held this sword. Except it's not really a sword, it's a part of him, the Light of Heaven an essential piece of the being and meaning that is 'angel' and 'Lariel' and 'of Heaven', all intertwined and impossible to separate without leaving parts whose sum is much lesser than the whole.
He is wounded, in the vision, and tired, and more than that he is hurting, because he was betrayed. Betrayed and left to die, by some of the allies for whose sake he left Heaven. And now the last of them to remain loyal lies wounded at his feet, perhaps dying, while the others lurk in the shadows beyond his sight.
A shadow moves forward out of the darkness and resolves into swarms of locusts that outline a shape. Deskari, but not; not quite the same as she saw this morning, not as big or as menacing. Not a full demon lord, to the angel's apprehension, but more than enough to kill him.
He cannot flee. He can spend his last strength attacking, and it will hold no meaning; or spend it healing his last and faithful ally, and have the demon kill her again.
What should he do? What can he do? The vision demands an asnwer. The angel seems to suffer from the pain of indecision as much as from his wounds.