Healing
It never ceases to amaze him how quickly they heal. Once one small part of them is better, the rest is not long in following. When one day she walks across the room, it does not take her much longer to be running around. Training as healing.
It is not long before she is going away again, not long before he fears once again for her. For it to happen again.
But it can't. It won't. He may not know her as she knows herself, but he knows; she is not fragile. She is not so easily broken, or so impossible to mend. She is strong, and so he believes.