Luke chose not to run away, but he did deactivate his saber and clip it to his belt, trying to show that he was not going to fight anymore. He let the two talk, watching from a distance, hoping she wasn't badly injured. Luke was obviously no healer, but he knew how to do a few things and could help if it was absolutely needed.
He did her her say that meditation would help it, and he thought that she probably was well enough versed in the Force to judge that for herself. He did also feel the dim strand of light from Kylo, and did take hope from it, however slight.